In four-o'clock plants, red flower color is dominant to white flower color. However, heterozygous plants have a pink color. If a pink-flowered plant is crossed with a white-flowered plant, what will be the phenotypic ratios of their offspring?
A) ¼ red, ½ pink, ¼ white
B) All pink
C) All white
D) ½ pink, ½ white
E) ½ red, ½ pink

Question

Quizplus · Accepted Answer

In this scenario, the pink-flowered plant is heterozygous (Rr) for the flower color gene, with R being the allele for red and r being the allele for white. The white-flowered plant is homozygous recessive (rr). When these plants are crossed (Rr x rr), the offspring will have a 1:1 ratio of Rr (pink) to rr (white) phenotypes.

In Four-O'clock Plants, Red Flower Color Is Dominant to White