most conjoined twins (siamese twins) are identical, but is it possible to have unidentical twins?
2007-01-25 09:14:19 · 16 answers · asked by Xing Xing 1 in Pregnancy & Parenting ➔ Other - Pregnancy & Parenting
No... fraternal twins are two separate eggs... identical twins are one egg that splits in to two... conjoined twins is one egg, that was supposed to split to become identical twins, but did not completely separate.
2007-01-25 09:23:54 · answer #1 · answered by naenae0011 7 · 3⤊ 0⤋
Identical twins occur because an embryo splits into two. Conjoined twins are where an embryo splits but not completely so as far as I know they are always genetically identical. I don't think 2 separate embryos can join together so producing conjoined unidentical twins
2007-01-25 09:37:03 · answer #2 · answered by teaser 2 · 2⤊ 0⤋
Conjoined twins are monozygotic twins whose bodies are joined together at birth. This occurs where the single zygote of identical twins fails to separate completely. This condition occurs in about 1 in 100,000 pregnancies. And them being monozygotic means a single egg is fertilized to form one zygote which then divides into two separate embryos. Monozygotic twins are genetically identical (unless there has been a mutation in development) and they are the same sex. Only three cases have been documented of mixed sex monozygotic NON-conjoined twins, so I think the likelihood of having them be BOTH is impossible. I'm not a geneticist, but it seems pretty clear that it's not going to happen.
2016-05-23 23:36:31 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Xing Xing, fact is not most but ALL conjoined twins are identical. As several people here have said, all conjoined twins result from incomplete spilittin of one fertilized egg. They have exactly the same genetic material. It is that straight forward. Check this webpage:
2007-01-25 09:33:40 · answer #4 · answered by eze_real 1 · 4⤊ 0⤋
Since conjoined twins are the result of a cell-split gone wrong somewhere, and since fraternal twins don't even share a sac, then I would say it's not possible for conjoined twins to be fraternal.
2007-01-25 09:20:52 · answer #5 · answered by annieohbee 3 · 6⤊ 0⤋
No, conjoined twins occur as the egg splits to make identical twins but does not split fully. If they weren't identical they would be from two seperate eggs :) identical twins are from one egg that splits.
2007-01-25 09:27:36 · answer #6 · answered by cosmicorderinggirl 1 · 4⤊ 0⤋
No they start off as one baby but the egg splits into two making idrntical twins
the reason they are conjoined is because they didn't split properly
2007-01-25 09:21:57 · answer #7 · answered by anniebell 5 · 6⤊ 0⤋
No, I thought they came from the same egg, so they always have to be identical. Non-identical always come from 2 different eggs, so they are separated in the first place.
2007-01-25 09:23:05 · answer #8 · answered by Princess415 4 · 5⤊ 0⤋
no, conjoined twins are incompletely separated identical twins.
2007-01-25 09:19:30 · answer #9 · answered by Heather Y 7 · 5⤊ 1⤋
conjoined are always identical ,you can't have a boy and girl , they are always of the same sex.
2007-01-25 09:24:15 · answer #10 · answered by MILLION DOLLAR QUESTION 5 · 4⤊ 0⤋