How do identical twins differ from fraternal twins?
A) Identical twins are formed from two separate eggs fertilized by two separate sperm cells, while fraternal twins are formed from a single egg that splits into two embryos.
B) Identical twins share 100% of their genetic material because they come from the same fertilized egg, whereas fraternal twins share about 50% of their genetic material and come from two separate eggs.
C) Identical twins are always of the same gender, while fraternal twins can be of different genders.
D) Identical twins result from different sperm fertilizing different eggs, while fraternal twins come from the same fertilized egg.