D is the answer (Aa and aa ) i hope this helps
Hemophilia is a recessive trait because the abnormal gene is responsible for the hemophilia carried on the X chromosome
Melanin- a large group of related molecules responsible for many functions so like pigment of the skin, hair and eyes
Carotene - pigments that are oxygen-free. Most are hydrocarbons (hydrogen and carbon ONLY) their colour varies from yellow to orange to red
