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Given three possible phenotypes for parents showing dominance (AA, Aa, aa), which combination would produce a 1:2:1 ratio of genotypes and a 3:1 ratio of phenotypes?

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doodlepoodlelover

Aa and aa will give you a 1:2:1 ratio

Aa and Aa will give you a 3:1 ratio

 

   a       a

A  Aa    Aa  

a  aa    aa

      A       a

A    AA     Aa

a    Aa      aa

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