In snapdragons, heterozygotes for one of the genes have pink flowers, whereas homozygotes have red or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers?

Question

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The red-flowered plants are homozygous dominant (RR) and the white-flowered plants are homozygous recessive (rr). Crossing them results in all heterozygous (Rr) offspring, which have pink flowers.

In Snapdragons, Heterozygotes for One of the Genes Have Pink