Question

The following is a cross between two individuals with the genotypes as indicated for four unlinked autosomal genes.

Aa Bb Cc dd X aa BB Cc Dd

1. For each gene, assume the capital letter indicates a dominant allele and the lower case letter (small) indicates a recessive allele. What proportion of the progeny would have the following overall phenotype: recessive phenotype for A, dominant phenotype for B, dominant phenotype for C, and recessive phenotype for D? (2 points)

2. Now assume that, unlike part 1, the two alleles of gene B show incomplete dominance and that the two alleles of gene C also show incomplete dominance. Like in part 1, for the alleles of genes A and D the capital letter is dominant and the lower case (small) letter is recessive. In this situation, what would be the proportion of the progeny with the following overall phenotype: recessive phenotype for A, dominant phenotype for B, dominant phenotype for C, and recessive phenotype for D? (3 points).

Answer 1