Question: 8 A botanist crosses two pink-flowered plants. The cross is a case of intermediate inheritance that involves alleles that were not clearly dominant or recessive and could make red- pink, and white-flowered plants. If four plants are produced from the cross, what is the expected number of white -flowered plants? A. 0 B. 1 C. 2 D. 3

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Question: 8 A botanist crosses two pink-flowered plants. The cross is a case of intermediate inheritance that involves alleles that were not clearly dominant or recessive and could make red- pink, and white-flowered plants. If four plants are produced from the cross, what is the expected number of white -flowered plants? A. 0 B. 1 C. 2 D. 3

Answer 1

This question is about genetics, specifically about the concept of incomplete dominance. Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely expressed over its paired allele. This results in a third phenotype in which the expressed physical trait is a combination of the phenotypes of both alleles. In this case, the pink-flowered plants are a result of the cross between red and white-flowered plants. Since the question states that the cross is a case of intermediate inheritance, it means that the pink color is a blend of red and white. Therefore, when two pink-flowered plants are crossed, the expected outcome is that all the offspring will be pink-flowered, as they will all receive one red and one white allele. Therefore, the expected number of white-flowered plants is 0.

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