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Is this possible that two identical twins differ in gender?

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Identical twins are formed when a zygote, which is formed after fertilization, splits into two and both of them grow into separate individuals. So all the charectiristics of identical (monozygotic) twins are same, even the gender. read more

The question doesn't ask if identical twins can be born with different sexes, the question asks if it is possible that identical twins (without specifying age) can differ in gender. They certainly can. Whether or not gender determination is a chioice, certainly one twin can choose to live as a gender different from the other. read more

Two girl twins can be either identical or fraternal (monozygotic or dizygotic). Two boy twins can be either identical or fraternal (monozygotic or dizygotic). A set of boy/girl twins can only be fraternal (dizygotic). Boy/girl twins cannot be identical (monozygotic). read more

Identical twins are almost always the same sex, but surprisingly there are a tiny number of boy-girl monozygotic twins. They result from an egg that contains an unusual mixture of sex chromosomes, not the usual XX for a girl, and XY for a boy. Occasionally an egg contains three sex chromes, two X's and a Y. read more

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