It is a myth that earwax is dependable on genetics. A single gene is not responsible for a kind of earwax one has, whether it is wet or dry and what color. The wet wax allele is also not dominant over the dry one. ¹⁾.

The amount of eumelanin and pheomelanin determine the hair color in humans. Eumelanin is dark brown, and pheomelanin is reddish. People who have large amounts of pheomelanin have red hair. ²⁾.

Despite tongue rolling being probably the most commonly used example of a genetic trait in humans, it is a myth that a gene is responsible for the skill. The studies demonstrate that tongue rolling is both influenced by genetics and by the environment. ³⁾.