What phenotypic ratio would you expect as a result of a test cross between two individuals where one that is homozygous recessive for alleles at two independent loci?
A) 3:1
B) 1:2:1
C) 9:3:3:1
D) 1:1:1:1
E) 9:4:2:1

Question

Quizplus · Accepted Answer

A test cross involves crossing an individual with a homozygous recessive individual. When both individuals are homozygous recessive for two independent loci, all offspring will receive one recessive allele for each locus from each parent, resulting in a uniform phenotype ratio of 1:1:1:1, reflecting the combination of the two loci's alleles.

What Phenotypic Ratio Would You Expect as a Result of a Test