A) One sperm fertilizes two ova
B) One ovum is fertilized by two sperms
C) Two ova are fertilized by two sperms
D) One fertilized ovum divides into two blastomeres and both of them separate
Correct Answer: D
Solution :
Twins are the two birth occurring at the same time in human, they are of peculiar genetic interest. Identical or monozygotic twins are formed when one sperm fertilizes one egg then, the fertilized egg and divides into two blastomeres and both of them separate. They have the same genotype and phenotype and are of same sex.
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