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Normal: 1 egg + 1 sperm make 1 person
Identical twins: 1 egg + 1 sperm make 2 person
Fraternal (non identical twins): 2 eggs + 2 sperms make 2 person
Normal: 1 egg + 1 sperm make 1 person
Identical twins: 1 egg + 1 sperm make 2 person
Fraternal (non identical twins): 2 eggs + 2 sperms make 2 person