A) Two sperms fertilize an ovum and the first two blastomeres separate from each other
B) One sperm fertilizes an ovum and first two blastomeres separate from each other
C) Egg develops parthenogenetically and first two blastomeres separate from each other
D) Two ova are fertilized simultaneously
Correct Answer: D
Solution :
Dizygotic twins are also called fraternal or nonidentical twins, formed by simultaneous fertilization of two different ova by two different sperms.
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