A Man Whose Parents Both Have Brown Hair Claims That

Multiple Choice

A man whose parents both have brown hair claims that his red beard was inherited from his maternal uncle. Why is this claim incorrect?

A) The Y chromosome has no role in scalp, facial, or body hair color.
B) Genetic traits are transmitted in only a direct vertical direction.
C) Females cannot transmit facial hair color to their sons.
D) Hair color is a polygenic trait, not a single-gene trait.