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    A polygenic character is controlled by two genes each with two alleles. How many different possible genotypes are there for this character?
    A. 2
    B. 4
    C. 9
    D. 16

    I chose B but the answer is C and my textbook isn't much help so does anyone know why?
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    AABB
    AABb
    AAbb
    AaBB
    AaBb
    Aabb
    aaBB
    aaBb
    aabb

    so 9 different genotypes...although it only gives 4 different phenotypes (as AA and Aa give the same phenotype, as do BB and Bb cos they have the dominant allele).
 
 
 
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Updated: November 14, 2008
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