In pea plants, the allele R produces a red flower and is dominant to the white allele (r).A pea plant with red flowers is test crossed, and one-half of the resulting progeny have red flowers, whereas the other half have 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

The test cross results (half red, half white offspring) indicate that the red-flowered parent must be heterozygous (Rr) to produce both red (Rr) and white (rr) offspring when crossed with a white (rr) parent.

In Pea Plants, the Allele R Produces a Red Flower