Fraternal twins can be the same sex or opposite sexes. It doesn't matter.
No. All identical twins are the same sex. Judith and Hamnet were opposite sexes, and so were fraternal twins.
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.
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.
there is no opposite. a zebra is a zebra.
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.
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.
Heterosexual is to be attracted to the opposite sex
A male donkey is called a jack, a female a jenny.
To chose not to have sex is to be celibate. To have no sexual interest is being asexual. The opposite sex is whatever sex you are NOT. If you are a male, females are the opposite sex, and vice versa.
No. The chances of them being the same sex are the same as if they were not twins at all.