Help with this dihybrid cross! I was doing fine using punnett squares in these problems until this question arose. "This cross will yield four phenotypes in the 1:1:1:1 ratio: Multiple choice Answer= RrYy x rryy! How is this possible?
by 
timothyryan
ANSWERS: 1
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The r gene and the y gene can each come from either mum or dad. Suppose mum = RrYy and dad = rryy. The four possibilities from your given answer all from mum: RrYy all from dad: rryy Rr from mum and yy from dad: Rryy rr from dad and Yy from mum: rrYy And they're all different, so 1:1:1:1 Oh, by the way I suspect y here stands for YELLOW meaning an arbitrary property. It doesn't mean the y chromosome.
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