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Q.

If a dihybrid cross is performed between two parents of genotype RRYY and rryy (round and yellow seed with wrinkled and green seed) in pea plants, the ratio between parental to recombinant phenotype in the F2 generation will be respectively

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a

9 : 7

b

10 : 6

c

7 : 9

d

15 : 1

answer is B.

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Detailed Solution

In the mendelian dihybrid cross the phenotypic ratio is 9 : 3 : 3 : 1 .Of this 9 + 1 = 10 are parental phenotypes and 3 + 3 = 6 are the recombinant types. So the ratio will be 10 : 6.
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