potterhead last edited by
How are non identical twins formed?
SRINIDHI V last edited by
@potterhead Two ova shed simultaneously from the ovary and each of them may be fertilized by different sperms and may develop in the usual manner. This results in non-identical(dizygotic or fraternal) twins. As each of them develops from a separate ovum, they have independent genetic constitutions. These twins, therefore, need not be of the same sex, nor do they resemble each other any more than children of the same parents that are born separately. These twins are therefore, non identical.