Question

In humans, brown hair is dominant and blond hair is recessive. Only 2% of people have red hair, and in order to receive it, both parents must pass the allele on to their offspring. What does this imply about red hair?(1 point)
Responses

It is sex-linked.
It is sex-linked.

It is codominant.
It is codominant.

It is dominant.
It is dominant.

It is recessive.
It is recessive.
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Answer 1

It is recessive.

Reason: the trait appears only when both parents pass the allele (homozygous recessive). The low frequency (2%) is consistent with a recessive allele (q^2 ≈ 0.02 ⇒ q ≈ 0.14).