Two loci control body color in beetles. In a cross between a black beetle and a white beetle you obtain a ratio of 9 black to 7 white beetles. What kind of gene interaction is this?
A) recessive epistasis
B) dominant epistasis
C) duplicate recessive epistasis
D) duplicate dominant epistasis
E) dominant and recessive epistasis

Question

Quizplus · Accepted Answer

The 9:7 ratio suggests duplicate recessive epistasis, where two genes are involved, and the presence of at least one dominant allele from each gene is required for the black phenotype. If both genes are homozygous recessive, the beetle is white.

Two Loci Control Body Color in Beetles