A pea plant with red flowers is test crossed, and one-half of the resulting progeny have red flowers, while the other half has white flowers. Therefore, the genotype of the test-crossed parent was
A) RR.
B) Rr.
C) rr.
D) either RR or Rr.
E) This cannot be answered without more information.

Question

Quizplus · Accepted Answer

If the progeny are split evenly between red and white flowers, it indicates a heterozygous parent (Rr) rather than a homozygous dominant (RR) or homozygous recessive (rr) parent. Therefore, the best choice is B) Rr.

A Pea Plant with Red Flowers Is Test Crossed, and One-Half