Identical twins, also known as monozygotic twins, are twins that form from the same egg and have the same genetic makeup. They look alike and are the same sex. Fraternal twins, also known as dizygotic twins, are twins that form from two different eggs and have different genetic makeup. They may or may not look alike and may be different sexes.
The difference between identical and fraternal twins is that identical twins are formed from the same egg and have the same genetic makeup, so they look alike and are the same sex, whereas fraternal twins form from two different eggs and have different genetic makeup, so they may or may not look alike and may be different sexes.
