Q.

Which of the given cross will result in 9 : 3 : 3 : 1 phenotypic ratio?

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a

RrYy x rryy

b

RRYy x RrYY

c

RRyy x rrYy

d

RrYy x RrYy

answer is D.

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Detailed Solution

When RrYy x RrYy then the phenotypic ratio is 9:3:3:1.  Based on dihybrid crosses, i.e., crosses between plants differing in two pairs of traits, Mendel proposed the law of independent assortment.
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Which of the given cross will result in 9 : 3 : 3 : 1 phenotypic ratio?