Final answer:
Skin color is a polygenic trait controlled by multiple genes, and it is not directly linked to eye color, hair color, or complex behaviors. The variation in skin color is an evolutionary adaptation to different environments.
Step-by-step explanation:
The inheritance of skin color is a complex trait that is not directly linked to eye color, hair color, or complex behaviors such as musical ability and morality. Skin color is primarily determined by the amount of melanin in the skin, which is controlled by multiple genes. It is considered a polygenic trait, meaning that it is influenced by the interaction of multiple genes. The variation in skin color can be attributed to evolutionary adaptations to different environments, such as the availability of sunlight in different regions of the world.