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construct a punnet square first

            RY          Ry            rY         ry

RY      RRYY     RRYy      RrYY      Rryy

Ry       RRYy      RRyy       RrYy      rryy

rY       RrYY       RrYy        rrYY       rrYy

ry       RrYy        Rryy         rrYy        rryy

then count the number with RRyy, Rryy, Rryy combinations.


RRyy =1/16 ,      RrYy=3/16,      Rryy=2/16

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