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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 characteristic.
-If True-breeding red long radishes are crossed with True breeding white oval radishes, the F₁ will be expected to be which of the following?

Question

Quizplus · Accepted Answer

The cross between true-breeding red long radishes and true-breeding white oval radishes is a cross between two individuals heterozygous for flower color and shape. The possible genotypes for this cross are RrLl (red and long), Rrll (red and oval), rrLl (white and long), and rrll (white and oval).

The cross between the two heterozygous individuals will yield offspring with a phenotypic ratio of 9:3:3:1, which means that 9/16 will have purple flowers and long shape, which is the only option that matches this description. Therefore, the expected F₁ will be purple and long.

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