Before we continue 口 Twin studies are significant between they allow researches to separate what is affected by environment and genes especially when twins are separated at birth different environment, but same genes Monozygotic twins share nearly 100% of genetic polymorphisms Dizygotic twins share about 50% of polymorphisms Baby A) Bab Twin studies ◼ are significant between they allow researches to separate what is affected by environment and genes. ◼ especially when twins are separated at birth ◼ different environment, but same genes ◼ Monozygotic twins share nearly 100% of genetic polymorphisms ◼ Dizygotic twins share about 50% of polymorphisms