What evidence supports this hypothesis? Select the four correct answers. Select the four correct answers. There are genes encoding the respiratory molecules myoglobin and various forms of hemoglobin. The existence of variable genes of heavy and light chains of immunoglobulins. The existence of gene families. There are genes encoding the digestive enzymes trypsin and chymotrypsin. There are genes encoding the enzyme complexes of electron transport chain. Duplication of the SRGAP2 gene in primates.