Presume That the Number of Leaves in Clovers Is Controlled

question 18

Multiple Choice

Presume that the number of leaves in clovers is controlled by the combined actions of two genes,A and B,with no contributions from the environment.A/A results in four leaves,A/a in three leaves,and a/a in two leaves.Moreover,the genotypes B/B and B/b result in one additional leaf (b/b has no effect on leaf number) . a) Based on the above information:

• A)A has an additive mode of action and B has a dominant mode of action.
• B)A has a dominant mode of action and B has an additive mode of action.
• C)both A and B have a dominant mode of action.
• D)both A and B have an additive mode of action.
• E)the respective modes of action of A and B cannot be determined.

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