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#12
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Maybe they are just going by the fact that they were in separate sacs.
Although we know differently in this group, a lot of people automatically assume fraternal just because of separate sacs. I even have people say that to me. My girls look so much alike that even my husband and I have trouble telling them apart sometimes, but we have not had them genetically tested. People argue with me that they MUST be fraternal because they were in separate sacs and separate placentas. Maybe that is what Mr and Mrs Olson are doing too. -- Terri & Rob Colton (11-29-00) Aimee and Kylie (12-22-03) Visit us at: http://www.babiesonline.com/babies/a..._kylie_colton/ "Nick Theodorakis" wrote in message ... On Fri, 25 Feb 2005 23:59:19 GMT, (Paula Johnson) wrote: [..] ...Olson twins are fraternal and I can't tell them apart at all (not that I try that hard ;-) So the claim goes. I wonder if they have been genetically tested, or just relying on the word of the OB. Nick -- Nick Theodorakis contact form: http://theodorakis.net/contact.html |
#13
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(Nick Theodorakis) wrote in
: On Fri, 25 Feb 2005 23:59:19 GMT, (Paula Johnson) wrote: [..] ...Olson twins are fraternal and I can't tell them apart at all (not that I try that hard ;-) So the claim goes. I wonder if they have been genetically tested, or just relying on the word of the OB. I remember being surprised last year when I heard that the Olsen twins were fraternal, I always thought they were identical. But I guess one is two inches taller than the other one, which would generally point to fraternal twins. (Although I assume you could have two identical twins and pump one full of growth hormone all their life and come out with two very different seeming adults, as an example.) When we found out that we were expecting twins last year, I did a lot of research. One thing I found was the talk of a third type of twin, ie not truely fraternal but not truely identical. These supposedly would come from one egg that splits and gets fertilized with two sperm. Therefore the mother's half of the genetic material is identical in both twins, which explains "fraternal" twins that look remarkably similar. I just googled and found this: http://www.betterhealth.vic.gov.au/b.../Twins_identic al_and_fraternal?open Supposedly this third type of twin is almost impossible to prove and cannot be distinguished from fraternal (which is just basically non-identical) Steve |
#14
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Steve Smith wrote in
9.130: snip When we found out that we were expecting twins last year, I did a lot of research. One thing I found was the talk of a third type of twin, ie not truely fraternal but not truely identical. These supposedly would come from one egg that splits and gets fertilized with two sperm. Therefore the mother's half of the genetic material is identical in both twins, which explains "fraternal" twins that look remarkably similar. I just googled and found this: http://www.betterhealth.vic.gov.au/b...pages/Twins_id entic al_and_fraternal?open Supposedly this third type of twin is almost impossible to prove and cannot be distinguished from fraternal (which is just basically non-identical) Actually, DNA testing would differentiate between all three possibilities. Fraternal twins will share 50% of their genes, ID's 99% (I don't think current tests admit 100% accuracy) and the polar body twins will share 75% of their genetic structure. Cindy Wells (who has enough bio and biochem to have heard of many of the issues with DNA analysis) Steve |
#15
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Cindy Wells wrote in
. 142: Steve Smith wrote in 9.130: snip When we found out that we were expecting twins last year, I did a lot of research. One thing I found was the talk of a third type of twin, ie not truely fraternal but not truely identical. These supposedly would come from one egg that splits and gets fertilized with two sperm. Therefore the mother's half of the genetic material is identical in both twins, which explains "fraternal" twins that look remarkably similar. I just googled and found this: http://www.betterhealth.vic.gov.au/b...pages/Twins_id entic al_and_fraternal?open Supposedly this third type of twin is almost impossible to prove and cannot be distinguished from fraternal (which is just basically non-identical) Actually, DNA testing would differentiate between all three possibilities. Fraternal twins will share 50% of their genes, ID's 99% (I don't think current tests admit 100% accuracy) and the polar body twins will share 75% of their genetic structure. Cindy Wells (who has enough bio and biochem to have heard of many of the issues with DNA analysis) Steve Oh, is that what people mean by saying "Polar Body twins"? I heard that term for the first time on a post here in the last week or so and didn't know what it meant. I didn't realize that "type" of twin was actually recognized, in the original article I read (not the one I linked to), it sounded like the author was just throwing a wild idea or something. Why the term "Polar Body"? I ask the question, but I'm just gonna google it now anyway, heh... Steve |
#16
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Steve Smith wrote in
9.130: snip Oh, is that what people mean by saying "Polar Body twins"? I heard that term for the first time on a post here in the last week or so and didn't know what it meant. I didn't realize that "type" of twin was actually recognized, in the original article I read (not the one I linked to), it sounded like the author was just throwing a wild idea or something. Why the term "Polar Body"? I ask the question, but I'm just gonna google it now anyway, heh... Steve I don't know how many actually accept the idea. However, polar body is the term I've heard most often for it. (I suspect the phrase gets its start from some portion of the cell splitting to egg cycle.) Cindy Wells (I haven't heard any DNA studies that give percentages of twins tested that turned out to include polar body twinning) |
#17
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On Mon, 28 Feb 2005 17:11:14 -0600, Cindy Wells
wrote: Steve Smith wrote in . 99.130: snip Oh, is that what people mean by saying "Polar Body twins"? I heard that term for the first time on a post here in the last week or so and didn't know what it meant. I didn't realize that "type" of twin was actually recognized, in the original article I read (not the one I linked to), it sounded like the author was just throwing a wild idea or something. Why the term "Polar Body"? I ask the question, but I'm just gonna google it now anyway, heh... Steve I don't know how many actually accept the idea. I don't. I haven't been able to find any evidence for it in the medical literature, either. Several years ago, I wrote some comments about this on this ng: http://groups-beta.google.com/group/alt.parenting.twins-triplets/msg/75bd419f47b413dc http://groups-beta.google.com/group/alt.parenting.twins-triplets/msg/0e469913a768cac4 Nick -- Nick Theodorakis contact form: http://theodorakis.net/contact.html |
#18
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wrote: On Mon, 28 Feb 2005 17:11:14 -0600, Cindy Wells wrote: I don't. I haven't been able to find any evidence for it in the medical literature, either. Several years ago, I wrote some comments about this on this ng: http://groups-beta.google.com/group/alt.parenting.twins-triplets/msg/75bd419f47b413dc http://groups-beta.google.com/group/alt.parenting.twins-triplets/msg/0e469913a768cac4 Nick -- Nick Theodorakis contact form: http://theodorakis.net/contact.html Great! |
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