Answer:
If both parents are carriers of albinism, an autosomal recessive trait, the chance that their child will have a homozygous genotype (in this case, two copies of the recessive allele) is 25%.
To explain this, let's consider the possible genotypes of the parents. Since they are carriers, they each have one copy of the normal allele (A) and one copy of the recessive allele (a).
When these parents have a child, there are four possible combinations of alleles that can be passed on: AA, Aa, aA, and aa.
Out of these four possibilities, only one genotype (aa) represents a homozygous condition where the child has two copies of the recessive allele, which leads to the expression of albinism.
Therefore, the chance that their child will have a homozygous genotype (aa) is 1 out of 4, or 25%.
In conclusion, the correct answer is c. 25%.
Step-by-step explanation: