Which of the following crosses will yield four phenotypes in the 1:1:1:1 ratio?
A) RRYY × RRYY
B) RRYY × rryy
C) RrYy × RrYy
D) RrYy × rryy
E) rryy × rryy

Question

Quizplus · Accepted Answer

Cross D (RrYy × rryy) will yield four phenotypes in a 1:1:1:1 ratio because it involves a dihybrid individual heterozygous for two traits being crossed with a homozygous recessive individual for those same traits. This results in equal probabilities of producing offspring with each of the four possible combinations of the two traits.

Which of the Following Crosses Will Yield Four Phenotypes in the 1:1:1:1