You have chosen to study the genetics of snapdragon flower color.True-breeding red-flowered plants crossed with true-breeding white-flowered plants generate all pink-flowered F₁ offspring.When the F₁ offspring are crossed, you get the following numbers of F₂ offspring: 24 red, 54 pink, and 22 white.You interpret this inheritance pattern as A) incomplete dominance. B) codominance. C) epistasis. D) blending. E) pleiotropy.

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Quizplus · Accepted Answer

The inheritance pattern seen in this scenario is consistent with incomplete dominance. When true-breeding red-flowered snapdragons are crossed with true-breeding white-flowered snapdragons, the resulting F1 generation consists of all pink-flowered plants. This suggests that the red and white flower color alleles are not completely dominant over each other, resulting in a blending of the two colors to create pink. When the F1 generation is crossed, the resulting F2 generation shows a ratio of 1 red : 2 pink : 1 white, which is consistent with incomplete dominance. In codominance, both alleles are fully expressed and would result in a different ratio of offspring. Epistasis involves one gene affecting the expression of another gene, which is not seen in this scenario. Blending and pleiotropy are not possible explanations for this inheritance pattern.

You Have Chosen to Study the Genetics of Snapdragon Flower