Given the parents AABBCc × AabbCc, assume simple dominance for each trait and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?
A) 1/4
B) 1/8
C) 3/4
D) 3/8
E) 1

Question

Quizplus · Accepted Answer

First parent genotype: AABBCc
Second parent genotype: AabbCc
Possible gametes of the first parent: AB, AB, Bc
Possible gametes of the second parent: Ab, c
Possible genotypes of offspring: AABBCC, AABBCc, AABbCC, AABbCc, AaBBCC, AaBBCc, AaBbCC, AaBbCc, AABBcc, AaBBcc, AABbcc, AaBbcc, AabbCC, AabbCc, Aabbcc, aaBBCC, aaBBCc, aaBbCC, aaBbCc, aabbCC, aabbCc, aabbcc
Out of these 24 possible offspring genotypes, 18 have at least one dominant allele from the first parent, and therefore phenotypically resemble the first parent. So the proportion of progeny that will be expected to phenotypically resemble the first parent is 18/24, which simplifies to 3/4.

Given the Parents AABBCc × AabbCc, Assume Simple Dominance for Each