Question

below is a punnett square that shows a model of human inheritance. a a a aa aa a aa aa key: a = straight hair (dominant); a = curly hair (recessive) which of the following must be true about the parent whose genes are aa? a the parent has curly hair b the parent has straight hair c the parent is capable of having aa offspring d the parents genes are dominant

Explanation:

In genetics, a recessive trait is expressed when an individual has two copies of the recessive allele. Here, 'a' is the recessive allele for curly hair and the parent has the genotype 'aa'. So, the recessive trait (curly hair) will be expressed. Also, since the parent only has 'a' alleles to pass on, it cannot have AA offspring. And the 'a' alleles are recessive, not dominant.

Answer:

a. The parent has curly hair