Question Detail
Question
In a certain plant, the allele for white fruit W is dominant over the allele for yellow fruit w. A white-fruited plant was crossed with a yellow-fruited plant. About half of the offspring were white-fruited and the other half were yellow-fruited, which genotypes did the parent plants have? A. ww and ww B. Ww and ww C. WW and ww D. WW and Ww
Correct Answer
Option B is the correct answer.
Detailed Explanation
A 1:1 phenotypic ratio in offspring indicates a test cross: a heterozygous dominant crossed with a homozygous recessive. The white-fruited parent must be heterozygous (Ww) and the yellow-fruited parent is homozygous recessive (ww).
Hint
This is a test cross ratio.