Two Genes, C and I, Which Undergo Independent Assortment, Affect

question 24

Multiple Choice

Two genes, C and I, which undergo independent assortment, affect feather color in leghorn chickens. Each gene has two alleles, one of which is dominant for feather color. The gene product of the dominant allele C is necessary for color in the feathers; however, the gene product of the dominant allele I is an inhibitor of color production in the feathers, even when C is present. What ratio of white feathers : colored feathers is expected among the progeny of the cross Cc Ii × Cc Ii?

• A)9:7
• B)10:6
• C)12:4
• D)13:3
• E)15:1

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