Let P = purple flowers and p = white,and T = tall plants and t = dwarf.Of the 16 possible gamete combinations in the dihybrid cross between 2 double heterozygotes,how many would produce the phenotype white,tall?
A)none
B)1
C)3
D)9
E)16

Question

Quizplus · Accepted Answer

In a dihybrid cross between two double heterozygotes (PpTt x PpTt), the gametes produced by each parent can be PT, Pt, pT, and pt. To get a white, tall phenotype, we need the genotype to be ppT_. This means we need a p from one parent and a p from the other parent, and at least one T from either parent. There are 3 combinations that can produce this phenotype: pT x pT, pT x pt, and pt x pT.

Let P = Purple Flowers and P = White,and T