Can a guy and a girl be joint twins...like Siamese twins?
- Anonymous1 decade agoFavorite Answer
No. Conjoined twins are identical twins. Identical twins come from the same fertilized egg which splits in two and then creates two children. With conjoined twins, the fertilized egg doesn't quite split entirely in two, so the twins are joined. By the time the egg separates it already has a set of genetic information included in which is whether or not the twins will be boys or girls.
Sets of twins who come from two different fertilized eggs are called "fraternal". Fraternal twins can be boy/boy, girl/girl or boy/girl since they come from two different eggs each with their own genetic information.
By the way the term "Siamese Twins" comes from a famous set of conjoined twins who were from Siam. They traveled with a circus as side-show "freaks" and their title of "Siamese Twins: became famous. It also, unfortunately, became the name that a lot of people use for conjoined twins. The two terms are not interchangable. The "Siamese Twins" were a set of brothers from Siam, this does not describe a set of sisters from Pennsylvania who are conjoined.
See the links below for more information. Also, try doing a search using the keywords, "conjoined twins".Source(s): http://multiples.about.com/cs/conjoinedtwins/a/con... http://www.twinstuff.com/conjoined.htm http://zygote.swarthmore.edu/cleave4b.html
- cereal_killer034Lv 51 decade ago
No, because Siamese twins are the result of identical twins that do not grow seperately and they cant be identical if ones a boy and ones a girl..those are fraternal twins and dont share the same sack.
- physandchemteachLv 71 decade ago
No. Conjoined twins occur when a single fertilized egg begins to divide and grow. For some reason the new cells separate enough to become two identical twins, but are so close the the twins bodies grow together as they develop.
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- CrystalLv 51 decade ago
The result of conjoined twins is when the fertalized ovum doesn't completely split when making identical twins. Fraternal twins come from 2 seperate fertalized eggs and they grow in 2 seperate amniotic sacs. Unless there are extremely rare cases, I haven't heard of it happening before. All of the conjoined twins I have ever seen have been of the same sex and identical.
- <3 The Pest <3Lv 61 decade ago
No. That only happens when multiples share the same placenta.
For instance, when identical twins are formed, the sperm fertilizes the ova, and the zygote splits in two. When Siamese twins occur, it means the zygote did not completely split at conception.
I hope that this helps alleviate any fears.
- 1 decade ago
A male and a female cannot be conjoined twins. This phenomenon results from one egg that begins to divide but does not completly finish the process. (If it did, the result would be identical twins.) Because these individuals would have the same DNA, they would have to be the same sex.
- sar sarLv 41 decade ago
No i dont think so because in order for that tohappen they have to be in the same sack and its very rare that faternal twins are in the same sack in the same sack they are identical twins and faternals are in seperate sacks anything is possible but I dont think that happens.
- ChrisLv 41 decade ago
No...Identical twins form in a single placenta..to be identical they would have to be the same sex. Fraternal twins form in separate placentas. To be conjoined they would have to be growing in the same placenta.