Two normally pigmented parents have an albino child. what are the parents' genotypes?

Both parent then have A allele.

Explanation:

Albinism is considered a lack of melanin pigmentation.

If the parents are pigmented and their child is an albino, those both parents seem to have the A allele. This is the recessive albinism, those parents are having albinism gene but neither of them have had albinism.

answer: a. a gene that causes a specific trait.