Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. What does this suggest?
A) that the parents were true-breeding for contrasting traits
B) that the trait shows incomplete dominance
C) that a blending of traits has occurred
D) that the parents were both heterozygous for a single trait
E) that each offspring has the same alleles for each of two traits

Question

Quizplus · Accepted Answer

A 3:1 ratio suggests that one parent was heterozygous (Aa, carrying one dominant and one recessive allele) and the other parent was homozygous recessive (aa, carrying two recessive alleles) for the trait being studied. This is called a monohybrid cross.

Two Plants Are Crossed, Resulting in Offspring with a 3:1