Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The part of the radish we eat may be oval or long, with long being the dominant trait. If true-breeding red long radishes are crossed with true-breeding white oval radishes, the F₁ will be expected to exhibit which of the following phenotypes?

Question

Quizplus · Accepted Answer

According to the information provided, a cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. This suggests that the allele for purple flowers is dominant over both the allele for red flowers and the allele for white flowers. 
Additionally, the information provided indicates that the allele for long radishes is dominant over the allele for oval radishes. This suggests that the F1 generation of true-breeding red long radishes crossed with true-breeding white oval radishes will be expected to be purple and long.

Radish Flowers May Be Red, Purple, or White