Question

Identical twins will be produced, when

• A. One spermatozoan fertilizes two ova.
• B. One ovum is fertilized by two spermatozoa.
• C. Two eggs are fertilized.
• D. One fertilized egg divides into two blastomeres and they become separate.

Answer 1

The correct option is D One fertilized egg divides into two blastomeres and they become separate.

One fertilized egg (ovum) splits and develops two babies with exactly the same genetic information. They are known as identical twins. In this case, one fertilized egg divides into blastomeres and they become separate. The self-contained halves then develop into two babies, with exactly the same genetic information.