Suppose That the "Fabulous" Phenotype Is Controlled by Two Genes

question 87

Multiple Choice

Suppose that the "fabulous" phenotype is controlled by two genes, A and B, as shown in the following diagram. Allele A produces enough enzyme 1 to convert "plain" to "smashing." Allele a produces no enzyme 1. Allele B produces enough enzyme 2 to convert "smashing" to "fabulous." Allele b produces no enzyme 2. The A and B genes are both autosomal and assort independently.
- What will be the phenotype(s) of the F₂ offspring of a true-breeding "fabulous" father and a true-breeding "plain" mother (aa bb) ?

• A) 9 "fabulous" : 7 "plain"
• B) 13 "fabulous" : 3 "plain"
• C) 9 "fabulous" : 3 "smashing" : 4 "plain"
• D) 12 "plain" : 3 "fabulous" : 1 "smashing"
• E) 15 "fabulous" : 1 "smashing"

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