Biology · Human Reproduction

In humans, fraternal (dizygotic) twins are formed when:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1A single egg is fertilized by one sperm, and the blastomeres separate during the first cleavage
2A single egg is fertilized by two different sperms simultaneously
3Two separate eggs are fertilized by two separate sperms at approximately the same time✓
4An unfertilized egg undergoes parthenogenetic development and splits during early cleavage

Correct answer

Two separate eggs are fertilized by two separate sperms at approximately the same time

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