Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?
A) RRYY x RRYY
B) RRYY x rryy
C) RrYy x RrYy
D) RrYy x rryy
E) rryy x rryy

Question

Quizplus · Accepted Answer

For a dihybrid cross the parents would need to be heterozygous for both of two traits. RrYy x RrYy would produce RRYY, RRYy, RRyy, RrYY, Rryy, rrYY, rrYy, or rryy as genotypes the phenotypes of these would be 9 dominant for both traits to 3 recessive for the first trait and dominant for the second trait to 3 dominant for the first trait and recessive for the second and 1 recessive for both traits.Bloom's

Which of the Following Crosses Will Yield Four Phenotypes in a Ratio