Monozygotic twins Rocio and Raquel have identical genes. They have many similarities, but have differences in their height, weight, and behavior. This is an example of epigenetics, which means ________.
1) The twins have different genetic makeup
2) The twins have the same genetic makeup but different phenotypes
3) The twins have different genetic makeup and different phenotypes
4) The twins have the same genetic makeup and the same phenotypes
