During fertilization, either X or Y chromosome of sperm gets attached with the ovum then how it is possible that the born twins are of a different gender?

Twins are divided into two parts:-

1. Identical Twins- It is also known as monozygotic as only one zygote is formed. In identical twins, one egg is fertilized by one sperm, but later the embryo splits up to become two.

In this case, the baby can only be a boy-boy or girl-girl.

2. Fraternal Twins- It is also known as dizygotic, as two zygotes are formed. In fraternal twins, two separate eggs get fertilised by two separate sperm independently, and each becomes an embryo.

In this case, the baby can be a boy-boy, girl-girl, and boy-girl.

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Updated on: 29-Mar-2023

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