Dictionary.com

Celine Dion is now the proud momma of twin boys. We’re happy for the entertainment diva, and pleased at the excuse to explore the language of twins. 

Dion’s boys are not identical twins. They’re fraternal. This means that they derived from separately fertilized ova and that they have different genetic makeup. Fraternal twins may be of the same or of the opposite sex.

While some fraternal twins resemble each other, some look as different as second cousins. Only time will tell which physical features the singer’s twins will have in common.

Naturally, identical twins do closely resemble each other and are always of the same sex. Identical twins develop from a single fertilized ovum and share the same genotype — meaning they share the same genetic stuff. The degree of shared DNA is called zygosity.

If you’re not a twin, then it’s likely that you’re a singleton. Card players are likely familiar with the term. A singleton is also a card that is the only one of a suit in a hand. It is also a phrase used to describe chronically single young people popularized by “Bridget Jones’s Diary.”

Siamese twins are congenitally united twins. The term is derived from a famous pair of conjoined twins named Chang and Eng who lived from 1811 to 1874. The twins were born in Siam, now named Thailand, and were joined at the chest.

Conjoined twins are so rare that statistics aren’t available to measure their incidence. Taken together, all types of twins make up about 1.9% of the world population.

63 Comments

  1. Ferret -  November 8, 2010 - 9:08 pm

    louis paiz: You’re welcome :)

    AMY-LOU: I believe I mentioned in one of my earlier posts how two twins can be mistaken for each other even when they look nothing alike. It is the same with people who are related to each other or around each other fairly often.
    To restate what I said earlier, human memory is nothing to envy. The hippocampus stores memories by taking a memory apart and then storing it. That’s how deja vu occurs. But I digress; what I mean to say by that is that an association between people, places, ideas, emotions, et cetera, are made through the storage of these memories. You and your sister, despite the large age difference, are associated together in your grandfather’s mind, so he may call you by her name just because information on the two of you is stored together in his hippocampus. The hippocampus atrophies with age, meaning that it loses tone and ability over time. As I said earlier, human memory errs, because no one is perfect. There are a few memory related disorders as well, associated with all sorts of factors, such as age, genetics, sleep patterns, and diet. I would have to say that the most likely reason for your grandfather’s forgetfulness is old age. I hope that answers your question. :)

    Reply
  2. Kate -  November 5, 2010 - 9:57 am

    @Ferret- I’ll let Lauren know, lol :O

    Reply
  3. louis paiz -  November 5, 2010 - 8:03 am

    to: ferret. i thank you very much for your pront answer to my question have a good day. thanks againg

    Reply
  4. AMY-LOU -  November 5, 2010 - 7:23 am

    hEY WHAT ABOUT WHEN YOU DON’T LOOK ALIKE AND PEOPLE LIKE LETS JUST SAY MY GRANFATHER KNOWS ME AND MY SISTER LOOK NOTHING ALIKE SHE IS 21 AND I AM ONLY 16 BUT WHEN HE IS TALKING TO ME HE CALLS ME JESSICA AND THAT IS CLEARLY NOT MY NAME. OR SOMETIMES HE CALLS ME JAMIE,RAMIE,MAMIE, AND DAMIE MANY OF TIMES(AFTER MY FAMILY JESSICA,RYAN,DANA, AND MICHEAL. HE THEN SAYS HE IS SORRY AND SAYS I KNOW THATS NOT YOUR NAME ITS AMY. I WAS WONDERING WHY HE DOES THAT????? CAN SOMEONE HELP ME OUT AND TELL ME THE ANSWER???????????????????

    Reply
  5. Ferret -  November 4, 2010 - 9:05 pm

    @Kate: You’re welcome :)

    Reply
  6. Ferret -  November 4, 2010 - 9:01 pm

    @louis paiz: In fact, twins are genetic. However, this does not hold true to all types of twins. Fraternal twins, such as the two you described, are the only type of twins that are genetic, as far as I know. So to answer you question simply, the answer is yes, twins do run in the family.

    In response to a few posts pertaining to being identified as or compared to one’s twin, there have been numerous twin studies pertaining to the behavior of identical twins without similar stimuli such as the influence of the twins on each other. There have been instances where these twins sometimes act as though they are the same person, even though their situations were drastically different. It is a thouroughly interesting study.
    Personally, I have been called by my twin’s name, although everyone, including the person who made the mistake, admits that she and I look nothing alike. It’s a psychological matter, I assume; the two twins are so often associated with each other, that the person makes a slip of sorts by calling out to one and meaning to talk to the other. It may seem offensive, but human memory is faulty and perceptional at best. However, in cases with more identical twins, the slip is more due to the similarity in appearance than a slip of the hippocampus.

    Reply
  7. louis paiz -  November 4, 2010 - 11:53 am

    i have a question . could that be possible tha to have tweens in the family run in our dna . for for three generations in my family tweens where unsucceful to be born, until now in my generation they succid an i have a handsome pair of tweens they are fraternal so distinct, one is blond and the other has black hair.

    Reply
  8. thedefenestrator -  November 3, 2010 - 5:44 am

    A friend of mine was once talking to a set of identical twins for a good fifteen minutes before asking them ‘So, how do you two know each other?’. Oh dear.

    I remember being quite surprised at how many people I knew at University who were twins. I’m not sure whether my twin-friend density was a fluke, or reflected the general spread of twin siblings, but I had at least five close friends who were all a twin (four fraternal, and one identical).

    There was a fascinating twin documentary on the BBC (*waves a lone English flag in a sea of American commenters!*) recently which showed me so much stuff I never knew about the genetics and psychology of twins. It’s truly fascinating.

    Reply
  9. Nanner -  November 1, 2010 - 12:57 pm

    @ Ashley
    I have 2 sets of identical twins! With there being 3 in your family, it wouldn’t surprise me if you were all monozygotic, I believe even though it doesn’t have a family history, there are some individuals who have a tendency to always have identical twins. I say this because it seems there are so many identical twin parents I run into, that (if they have other children) have more twins.
    You should really have a DNA test to find out for sure. The methods doctors used to determine zygosity before DNA testing were not sophisticated enough to be reliable.

    Reply
  10. Kate -  November 1, 2010 - 9:27 am

    @Ferret- Thanks! And Lauren is like the opposite of anything bad luckish so I must be in the right culture! :D

    Reply
  11. AMY-LOU -  November 1, 2010 - 7:45 am

    I still think its sad sometimes because I never got to meet him/her at all and it would of been cool to have a double with me. You see I am the middle out of 5 children. I have one older sister who is 22 now, one older brother who is 21 now, and two baby brothers who are 13 and 11, and then theres little ol me who is 16. On the bright side I can have twins when I get older!!!!!!!!!!!!!!!!!!!!!!!!!

    Reply
  12. AMY-LOU -  November 1, 2010 - 7:37 am

    Omg!!! When my mom was prego with me i was a twin but she lost the other baby and i only surrived. Wow there would of been two of me!!!!!!!!!!!!!!!

    Reply
  13. Carol -  November 1, 2010 - 7:34 am

    I’m a fraternal twin. My twin looks much more like my cousin than she does like me, but we’ve been asked quite frequently if we are identical. I remember one occasion when someone was standing right in front of us and asked if we were identical (duuh!) We looked at each other, then I offered, “Well we used to be, but then there was the car crash – sis went right through the window.” I must admit we did get some strange looks from this person when we both laughed.
    Sometimes when asked if I am an identical twin, I respond that we are Siamese twins joined at the sense of humour.

    Reply
  14. Wienerschnitzel -  October 31, 2010 - 9:47 pm

    Kath, sounds like you’re in love with your brother. I bet your husband is awfully jealous!

    Reply
  15. galigaligalikson -  October 31, 2010 - 6:54 am

    the problem is a fluke remains there to be synchronized–too bad

    Reply
  16. galigaligalikson -  October 31, 2010 - 6:49 am

    I am growing synchronizing the emotions that has brought up by the background of being expressed. In other words I am getting to you.

    Reply
  17. Ferret -  October 29, 2010 - 10:28 pm

    There are a few types of twins not mentioned here as well, such as half-identicals, mirror identicals, and twins of separate fathers. Half identicals came from the same ovum, but it split before it was fertilized by separate sperm. If the sperm and ovum are combined before the split that creates the two separate zygotes, then the time at which the split occurs determines the type of twin. If the split occurs in the first ten days after fertilization, the twins will be complete identicals, and will look exactly alike. If the split occurs between the tenth and thirteenth day after fertilization, then the twins will be mirror twins- that is to say, they will come to look like mirror images of each other. If the split occurs after the thirteenth day after fertilization, the twins will become conjoined or siamese twins. Twins of different fathers is rare, but not unheard of. It is where two ova are fertilized by sperm of different men.

    I happen to be very blessed with a fraternal twin sister, a set of identical twin brothers, and fraternal twin cousins, one male and one female. My sister and I are as different as the two hemispheres of the brain. I am a right-brained person, so I think with a more creative mind. My sister, however, is very obviously left-brained, as she thinks more logically and analytically than I. Many people have a hard time accepting the fact that we are, in fact, twin sisters. Nevertheless I am proud to be her twin.

    Reply
  18. Ferret -  October 29, 2010 - 10:27 pm

    Kate: Perhaps you mean doppelgangers? They are people who appear to be completely identical twins but are totally unrelated by blood. They are also said to be bad luck in some cultures, so be careful! ;)

    Reply
  19. Kate -  October 29, 2010 - 9:48 am

    Someone please answer this! Is there a special term for people that look EXTREMELY similar, but aren’t related whatsoever? Because that’s definately me and my friend Lauren. :o

    Reply
  20. Cyberquill -  October 28, 2010 - 10:51 pm

    If you’re not a pear, then it’s likely that you’re a sappleton.

    Reply
  21. sillygooses567 -  October 28, 2010 - 10:04 pm

    I’m a twin and its really annoying sometimes. People always call me by my twin’s name and it makes me think they don’t even care who I am. I like my twin but its just hard. being a siamese twin would SUCK. think about it you wouldn’t have your own body.

    Reply
  22. Kieth Lavadia -  October 28, 2010 - 9:49 pm

    I am happy am not singleton… I have my fraternal twin, Keith is his name.. My nickname is Red, his is White… Nothing just want to share the happiness of having a twin..

    Reply
  23. Eyewitness -  October 28, 2010 - 9:42 pm

    Adult friends of mine who were born identical twins are now in their early 50′s and it is interesting to see how their appearances change with time. When they were in their twenties, they could pass for each other easily. Now they exhibit a “family resemblance” but are by no means identical. And that is by natural process–neither one of them has radically altered their appearance by their behavior, such as substance abuse. They just don’t look that much alike anymore. So interesting to see that evolve.

    Reply
  24. Bilas Rik -  October 28, 2010 - 8:57 pm

    You are called handsome Han the Solo singleton.

    As an aside, some say Han and Leia went on to have twins, the Solo twins.

    Reply
  25. Peyton -  October 28, 2010 - 8:13 pm

    Being a twin would be cool until people decide to get smart enough to begin comparing you to the other… and then it would suck.

    Reply
  26. IngletonENGLAND -  October 28, 2010 - 7:04 pm

    That explains the oddball song “She was a Singleton from Ingleton”

    Reply
  27. Kath -  October 28, 2010 - 6:57 pm

    Thank you, Gonzo 411 for posting all that wonderful info.

    I am the female half of such a twinship, and my brother is the greatest blessing anyone in the world could possibly ever wish for. It always breaks my heart when I hear about twins who are each other’s most hated enemy. That would be horrific to have a psychic bond and true oneness with someone who hated you as much as you hated them!!! Heartbreaking…

    We are not that kind of twinship. We are the kind you always hear about, where the closeness is so eerie, it freaks people out. My husband says that if one of us should die (God forbid) suddenly, the other would simply drop dead on the spot, no matter where they were, and what they were doing. He doesn’t believe we are capable of being in the world, still breathing, with the other one gone. I think he’s right.

    My brother and I are six minutes apart. He was born first, at six minutes after midnight. I came along at 12:12 am. He never lets me forget he’s my “big brother”, and he can be quite bossy, but it’s never a mean sort of bossy. I don’t think he’s capable of cruelty to anyone. He is the gentlest person I know.

    I love him more than my own life. It’s true about Turner’s. While my brother is very healthy and very strong, I have always been horribly delicate because of all the problems Turner‘s causes. Thank God he understands me when the rest of the world might not always get it. He is the kindest, most compassionate person I know. He always builds me up and “helps me cry” (that’s how he puts it) when life sucks.

    The twin bond is the most beautiful sort of love. My brother’s job takes him all over the globe. He even knows when I’m in trouble, no matter what part of the world he’s in. I also sense his troubles. Once he was in Australia, (I’m in Texas) and I actually experienced his flu symptoms when I didn’t have the flu.

    Once when he was in NY, I had horrible muscle spasms down my left leg in the middle of the night. I woke up to the sound of my own voice screaming out for him, to please come help me. I need to mention that my brother is NOT a night owl by any definition:

    I woke up, my face soaked in tears, screaming for him to please come help me, it hurt soooo bad… I sat up, realizing that I was alone, and my brother was halfway across the country, and I needed to deal with the pain. I took a painkiller and a muscle relaxant, and decided to fart around online while I waited for it to work. About two seconds after I logged on, his IM window popped up. He didn’t even say hello, he said, “Where does it hurt, Sunshine?”

    I knew he had a crazy work schedule the next day, so I tried my best to BS my way out of it, saying, I don’t know what you mean…you’d think after four decades, I’d realise this doesn’t work with him. Damn.

    He goes, “It’s your left leg. It feels like someone lit it on fire.“

    I was GOBSMACKED. I said, “HOW DO YOU DOOOO THAAAATTTT???!!!” He said, “You do it, too. Besides, I heard you calling my name.”

    Like it’s just nothing!!!!

    You never really get used to that eerie twin bond, at least I still get shocked every time he reads me like a book.

    So he knew I was in horrific pain. What could I do, he had me. I admitted it, then tried to downplay the pain. Of course he knew I was full of it. He reminded me that he was the ONE person in the whole world I could never fool. Good point, Bro.

    Well, we moved the convo to the phone and stayed up chatting and laughing, and eating ice cream and yawning and I kept trying to convince him I was fine, so go to bed already. Yeah, right. He informed me HE would tell ME when the pain was all better, cos he could feel it.

    Damn know-it-all. I love him so much!!

    It was a whole hour before the pain went away. I thank God every day for the greatest, best brother, best friend, coolest confidante and kindest, warmest encourager anyone could ever wish for. I couldn’t have had a better brother if I invented him myself. He’s the most amazing human being. I feel like I won the soul lottery, getting the privilege of having a brother like that to have come from the same egg alongside me. He is truly my other half. For us, the term Better Half means a twin thing. I know I’m very blessed. HE’s the better half.

    My mother said that when we were a few days old, she tried to put us in separate cribs set up in the nursery cattycorner. That was simply tooooo far away. Every time someone separated us, we squalled like someone was killing us. My poor, sleep-deprived daddy got up and put us in the bed with mom. He took our cribs apart, then took them down to his workshop and fused both cribs together, creating a double crib. He put it together in the nursery and dropped off to bed. Mom said she woke up the next day freaking out cos we weren’t in the bed. She ran to the nursery and saw us intertwined, happily sleeping.

    My brother still says any more than a heartbeat away from me is just too far. I love being a twin!!! xo
    Thank you, Gonzo. You totally rock!!

    Reply
  28. Ashley -  October 28, 2010 - 6:52 pm

    my twin and i are the only surviving full pairs of twins in my family- my mom had three pairs of twins, and there is NO history of twins in my family… my second oldest sister had a twin, but she was born premature, and died after two weeks, and my other sister was also a twin, but hers was born still born. me and my twin look the EXACT same… even though we’re supposed to be fraternal… i think its called semi-identical??? and it supposed to be super rare… has anyone heard of that??
    p,s for those of you who wish you were twins: its pretty cool sometimes.. but get really tough to handle sometimes.. it gets SOOOO annoying when you meet the stupidest people who know you’re a twin and immediately assume you and your twin are like one person or something.. :(

    Reply
  29. cynthia -  October 28, 2010 - 6:42 pm

    wow!! i know 2 sets of twins! one set is born the same day i am! hahaha so far all the people i know that have the same birthday as me but they are all female!!! 0.o soo random i know but heyy being a singleton is cool too!!!

    Reply
  30. Rebecca -  October 28, 2010 - 6:01 pm

    why want to be a twin when you can just be a singleton and get all the attention??????

    Reply
  31. margo -  October 28, 2010 - 5:55 pm

    i like twins

    Reply
  32. MadMadameMim -  October 28, 2010 - 4:47 pm

    And @Gonzo: Identical twins always come from one egg and one sperm therefore, they always have the same DNA. A male/female set may look very similar, but are never identical. Looks can be decieving. The Olsen twins may look identical, but are fraternal.
    That is why fingerprints are more acurate than DNA testing. Fingerprints, unlike DNA, are affected by enviromental factors as well as by genetics. A forensic detective told me that. As well as the book my mom got her “where do babies come from” speech from. As well as my bio textbook, and my zoology textbook, and several other reputable sources. As well as common sense. So if there is a set of identical male-femal twins out there, then one of them is a freak of nature who’s gender contradicts with his or her chromosomes.

    Reply
  33. Arthur -  October 28, 2010 - 4:44 pm

    I am an identical twin. People used to ask me – what is it like to be a twin? That’s all I’ve ever known – I used to ask back – What’s it like not to be a twin? But there is more. I have an older son and a set fraternal twins and so does my brother, so we are twins with twins.

    Reply
  34. C -  October 28, 2010 - 4:40 pm

    What if you were a twin originally, but the other twin was miscarried during the pregnancy?

    Reply
  35. MadMadameMim -  October 28, 2010 - 4:25 pm

    My neighbor has triplets, which isn’t that weird except for the fact that two are identical and the third fraternal. It’s weird and cool at the same time.

    Reply
  36. senor smothie buns -  October 28, 2010 - 4:21 pm

    Singleton? I thought I was a semitwin.

    Nathan Hunter on October 28, 2010 at 10:25 am
    I would so love to be a Siamese twin. It would be totally weird, but I just think the idea would be totally awesome. I think I’m kind of alone on this hope though.

    Mrs. J. on October 28, 2010 at 10:48 am
    Nah. It’s demi-twin.

    Mark V on October 28, 2010 at 11:00 am
    Google suggests Semitwins are 2 sperms fertilizing one eggs, resulting in 2 kids that share the same chunks of moms DNA, while getting varrying chunks of dads.

    Singleton is just a plain, ordinary, single kid. No microscopic gymastics taking place. It is also used in like, twelve different kinds of science-maths.
    http://en.wikipedia.org/wiki/Singleton

    Renee rosiak on October 28, 2010 at 11:08 am
    I have boy/girl twins and it is amazing to me how many people ask me if they are identical.

    daytreona patterson on October 28, 2010 at 11:09 am
    nice and very funny

    Arda Xi on October 28, 2010 at 11:12 am
    @Cyberquill – Ah, yes, and a Siamese twin is a sesquitwin.

    Michael Dadona on October 28, 2010 at 11:32 am
    Good to know about “Fraternal twins” developed from the two separately fertilized ova. The word for “separately” making me more understand about fraternal society.

    Allyx on October 28, 2010 at 11:56 am
    Wouldn’t sesquitwin mean there were 50 of them? Or is it 150?

    L.T. on October 28, 2010 at 12:41 pm
    A baby.

    BORN SOLO | BLOGCHI@mayopia.com on October 28, 2010 at 1:12 pm
    [...] SIMPLE SINGLETON? — We thought we were born a baby — though MOM did most of the pushing and suffered all the pain. — Carrying a big chunk of coal with a tiny brain — the immediate attachment when detachment cut the cord — we deserve no recognition for being born — it’s Mom should get the reward. — In most cases anyway — otherwise envy brings with it scorn. –>>Rupert L.T.Rhyme [...]

    chombu on October 28, 2010 at 1:19 pm
    I am an identical twin and my sisters are fraternal twins. I learned very quickly the difference of the two. My twin and I were asked if we were twins then asked if we were sisters! I thought that was the funniest thing.

    Barry sanders on October 28, 2010 at 1:25 pm
    that is very weird

    felicity on October 28, 2010 at 1:51 pm
    i could never be a saimese twin! 1. that’s nasty. 2. i couldn’t walk like that. and 3. that’t nasty!!!

    felicity hunter on October 28, 2010 at 1:53 pm
    oh but i’d love to be a twin

    Jessica on October 28, 2010 at 1:54 pm
    I’m a fraternal twin, and people just think that we’re best friends. We look so much different from each other, it’s like night and day! My sister takes after our mom, and I take after my dad.

    felicity hunter on October 28, 2010 at 1:58 pm
    i could’t be a saimese twin! 1. it’s nasty. 2. how do you walk? and 3.it’s nasty!!!! oh but i’d love to be a twin

    Gonzo411 on October 28, 2010 at 1:58 pm
    There is a very rare case where identical twins can be of opposite gender. However, it does depend on what definition you’re using for “identical.” I found the following in a web search for the explanation of how this can be. It was posted by a reader on answerbag.com, and comes closest to what I remember from college.

    “Identical twins” is a colloquial way of saying monozygotic twins. This term means, essentially, that they are derived from a single fertilisation and therefore share the same genetics.

    These twins might be incredibly similar in appearance but I doubt if any are truly identical in every way (certainly their fingerprints should be different). So really, “identical” twins are really “incredibly similar and derived from the same fertilisation” twins (although that’s not as catchy).

    Biology is weird however and things can go awry in the most unexpected of ways. In fact monozygotic twins CAN end up with different sexes. However, it should be made clear that this is an extremely rare event. Don’t get the idea that this is in anything but the most extraordinarily exceptional cases. And it certainly doesn’t really seem that the female twin would develop terribly well as she would have Turner’s Syndrome.

    So, in fact, despite people’s gut reaction of “well if they’re identical they HAVE to be the same sex” this is not always the case and “identical” twins can differ in sex. The two things to remember is that “identical” isn’t really a precise word anyway as no monozygotic twins are truly identical. And that the frequency of sexually different monozygotic is extremely low. It would be incredibly unlikely that you’ll ever meet sexually discordant monozygotic twins.

    Here are some sources to back up what I’m telling you:

    http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1012913

    http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1013354

    http://8e.devbio.com/article.php?id=111

    http://multiples.about.com/od/funfacts/a/boygirlident.htm

    http://www3.interscience.wiley.com/journal/110525547/abstract?CRETRY=1&SRETRY=0

    Read more: Can identical twins be of opposite genders? | Answerbag http://www.answerbag.com/q_view/330802#ixzz13gmkGyMA

    jamale on October 28, 2010 at 2:05 pm
    the best thing is wen there is like 20 twins lined up at a stills and nash concert .

    Sheena on October 28, 2010 at 2:26 pm
    I wish I was a twin!!! I think it would be so cool and special to have someone who knows you that well,and is so closely connected. Whether identical or fraternal. Being a singleton is boring!
    I wrote all of this you retards
    Alice on October 28, 2010 at 2:33 pm
    Even though my sister and I are identical twins, someone who’s never seen us before wouldn’t know we were twins unless someone told them.

    Patricia on October 28, 2010 at 2:41 pm
    God knows what we can handle, singleton, twins. This wonderful information to know..

    Waldo Pepper on October 28, 2010 at 2:44 pm
    What is it called if you’re born Han Solo?

    Reply
  37. Vroom Vroom -  October 28, 2010 - 4:16 pm

    Han Solo

    Reply
  38. Audrey M Sheppard -  October 28, 2010 - 4:12 pm

    My sister has twin girls. One has red curly hair and one has straight blond hair, and people have asked if they’re identical, too. LOL

    Reply
  39. Tysie -  October 28, 2010 - 3:43 pm

    Congrats to one of the most beautiful singers of all time on her new bundles of joy. I am the mother of a 15 year old son and I would love to be the proud mother of twins…2 beautiful baby girls Alexia & Alasia would be their names….

    Reply
  40. Thomas Lawrence -  October 28, 2010 - 3:28 pm

    Waldo pepper, that means you’re born with one hand, silly. Leave off the “d” (in h-a-n-d) for “dextrous.”

    Reply
  41. Waldo Pepper -  October 28, 2010 - 2:44 pm

    What is it called if you’re born Han Solo?

    Reply
  42. Patricia -  October 28, 2010 - 2:41 pm

    God knows what we can handle, singleton, twins. This wonderful information to know..

    Reply
  43. Alice -  October 28, 2010 - 2:33 pm

    Even though my sister and I are identical twins, someone who’s never seen us before wouldn’t know we were twins unless someone told them.

    Reply
  44. Sheena -  October 28, 2010 - 2:26 pm

    I wish I was a twin!!! I think it would be so cool and special to have someone who knows you that well,and is so closely connected. Whether identical or fraternal. Being a singleton is boring!

    Reply
  45. jamale -  October 28, 2010 - 2:05 pm

    the best thing is wen there is like 20 twins lined up at a stills and nash concert .

    Reply
  46. Gonzo411 -  October 28, 2010 - 1:58 pm

    There is a very rare case where identical twins can be of opposite gender. However, it does depend on what definition you’re using for “identical.” I found the following in a web search for the explanation of how this can be. It was posted by a reader on answerbag.com, and comes closest to what I remember from college.

    “Identical twins” is a colloquial way of saying monozygotic twins. This term means, essentially, that they are derived from a single fertilisation and therefore share the same genetics.

    These twins might be incredibly similar in appearance but I doubt if any are truly identical in every way (certainly their fingerprints should be different). So really, “identical” twins are really “incredibly similar and derived from the same fertilisation” twins (although that’s not as catchy).

    Biology is weird however and things can go awry in the most unexpected of ways. In fact monozygotic twins CAN end up with different sexes. However, it should be made clear that this is an extremely rare event. Don’t get the idea that this is in anything but the most extraordinarily exceptional cases. And it certainly doesn’t really seem that the female twin would develop terribly well as she would have Turner’s Syndrome.

    So, in fact, despite people’s gut reaction of “well if they’re identical they HAVE to be the same sex” this is not always the case and “identical” twins can differ in sex. The two things to remember is that “identical” isn’t really a precise word anyway as no monozygotic twins are truly identical. And that the frequency of sexually different monozygotic is extremely low. It would be incredibly unlikely that you’ll ever meet sexually discordant monozygotic twins.

    Here are some sources to back up what I’m telling you:

    http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1012913

    http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1013354

    http://8e.devbio.com/article.php?id=111

    http://multiples.about.com/od/funfacts/a/boygirlident.htm

    http://www3.interscience.wiley.com/journal/110525547/abstract?CRETRY=1&SRETRY=0

    Read more: Can identical twins be of opposite genders? | Answerbag http://www.answerbag.com/q_view/330802#ixzz13gmkGyMA

    Reply
  47. felicity hunter -  October 28, 2010 - 1:58 pm

    i could’t be a saimese twin! 1. it’s nasty. 2. how do you walk? and 3.it’s nasty!!!! oh but i’d love to be a twin ;)

    Reply
  48. Jessica -  October 28, 2010 - 1:54 pm

    I’m a fraternal twin, and people just think that we’re best friends. We look so much different from each other, it’s like night and day! My sister takes after our mom, and I take after my dad.

    Reply
  49. felicity hunter -  October 28, 2010 - 1:53 pm

    oh but i’d love to be a twin ;)

    Reply
  50. felicity -  October 28, 2010 - 1:51 pm

    i could never be a saimese twin! 1. that’s nasty. 2. i couldn’t walk like that. and 3. that’t nasty!!!

    Reply
  51. chombu -  October 28, 2010 - 1:19 pm

    I am an identical twin and my sisters are fraternal twins. I learned very quickly the difference of the two. My twin and I were asked if we were twins then asked if we were sisters! I thought that was the funniest thing.

    Reply
  52. BORN SOLO | BLOGCHI@mayopia.com -  October 28, 2010 - 1:12 pm

    [...] SIMPLE SINGLETON? — We thought we were born a baby — though MOM did most of the pushing and suffered all the pain. — Carrying a big chunk of coal with a tiny brain — the immediate attachment when detachment cut the cord — we deserve no recognition for being born — it’s Mom should get the reward. — In most cases anyway — otherwise envy brings with it scorn. –>>Rupert L.T.Rhyme [...]

    Reply
  53. L.T. -  October 28, 2010 - 12:41 pm

    A baby.

    Reply
  54. Allyx -  October 28, 2010 - 11:56 am

    Wouldn’t sesquitwin mean there were 50 of them? Or is it 150?

    Reply
  55. Michael Dadona -  October 28, 2010 - 11:32 am

    Good to know about “Fraternal twins” developed from the two separately fertilized ova. The word for “separately” making me more understand about fraternal society.

    Reply
  56. Arda Xi -  October 28, 2010 - 11:12 am

    @Cyberquill – Ah, yes, and a Siamese twin is a sesquitwin.

    Reply
  57. Renee rosiak -  October 28, 2010 - 11:08 am

    I have boy/girl twins and it is amazing to me how many people ask me if they are identical.

    Reply
  58. Mark V -  October 28, 2010 - 11:00 am

    Google suggests Semitwins are 2 sperms fertilizing one eggs, resulting in 2 kids that share the same chunks of moms DNA, while getting varrying chunks of dads.

    Singleton is just a plain, ordinary, single kid. No microscopic gymastics taking place. It is also used in like, twelve different kinds of science-maths.
    http://en.wikipedia.org/wiki/Singleton

    Reply
  59. Mrs. J. -  October 28, 2010 - 10:48 am

    Nah. It’s demi-twin. ;)

    Reply
  60. Nathan Hunter -  October 28, 2010 - 10:25 am

    I would so love to be a Siamese twin. It would be totally weird, but I just think the idea would be totally awesome. I think I’m kind of alone on this hope though.

    Reply
  61. Cyberquill -  October 28, 2010 - 10:22 am

    Singleton? I thought I was a semitwin.

    Reply

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