If twins are of two different sexes,they must be fraternal.

Name: If twins are of two different sexes,they must be fraternal.
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Question

Quizplus · Accepted Answer

Fraternal twins result from the fertilization of two different eggs by two different sperm. If one fertilized egg has an X chromosome and the other has a Y chromosome, the resulting twins would be of different sexes and thus fraternal. Identical twins, on the other hand, result from the splitting of a single fertilized egg and are therefore always the same sex.

If Twins Are of Two Different Sexes,they Must Be Fraternal