Certainly not. If they were different sexes they would not be identical. What if the embryo has the XXY chromozone and then it splits? Therefore, there would be one embryo with XX and the other with XY ~ opposite sex, yet identical.
No. All identical twins are the same sex. Judith and Hamnet were opposite sexes, and so were fraternal twins.
Identical twins are formed from a single fertilized egg that splits into two embryos. Because they share the same genetic material, identical twins are always the same sex. Opposite-sex twins are typically fraternal twins, formed from two separate eggs fertilized by two different sperm.
Yes.
Yes. Conjoined twins are always identical (monozygotic) twins, and identical twins are always the same sex.There is a theoretical case where identical twins could be opposite genders, when the babies are female but in one of the females, a branch of one X chromosome breaks away; however, I don't believe this has ever been observed.
No, monozygotic twins would be the same sex. Monozygotic twins come from one single fertilized egg, or zygote, which then splits to create two separate zygotes which will be genetically identical, or "identical twins", which will always be of the same gender.
The DNA of identical twins and of clones is, apart from random, environmentally produced mutations, 100% identical. The only difference is that clones are produced on purpose through advanced bioengineering techniques while identical twins happen as an accident of nature. Identical twins are, in a sense, natural clones.
They can be. While identical twins always have to be the same gender, fraternal twins usually are not. However this is not always the case. Identical twins occur because they inhabit the same egg. Fraternal twins because two eggs were fertilized at the same time. So fraternal twins could be the same gender, but usually they are of the opposite gender.
siblings
No, it is not possible for identical twins to have different sex chromosome conditions like Turner syndrome and Klinefelter syndrome. Identical twins develop from a single fertilized egg, so they have the same genetic material, including the sex chromosomes. If there was a nondisjunction event in one twin leading to an abnormal number of sex chromosomes, it would affect both twins, not just one.
Twins who are of the opposite sex or do not look alike are fraternal twins ~ not identical. This means that at the time of their conception ~ two eggs were fertilised. In the case od identical twins, one egg is fertilised and split in half.
Identical Twins are the result of a single fertilized egg spliting in two producing two genetically identical children. Fraternal twins are the result of the mother producing two eggs each fertilized by a different sperm from the father. This can result in opposite sex twins.
Yes. Identical twins come from one fertilized egg that has been split in two. Therefore, whatever sex the single egg would've been, the twins will be.