It is a myth that earwax is dependent on genetics. A single gene is not responsible for the 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⁾.