Which of the following is correct for dihybrid cross?

1 YYRR, 2YyRR, 2yyRr, 4 YyRr

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1 YYRR, 3YyRR, 2yyRr, 3 YyRr

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3 yYRR, 3YyRR, 2yyRr, 4YyRr

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3 YYRR, 1YyRR, 2yyRr, 3YyRr

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Solution

The correct option is A 1 YYRR, 2YyRR, 2yyRr, 4 YyRr
A dihybrid cross between RrYy x RrYy :
Gametes
YyRr --->
YyRr
YR Yr yR yr
YR YYRR
YYRr
YyRR
YyRr
Yr YYRr
YYrr
YyRr
Yyrr
yR YyRR
YyRr
yyRR
yyRr
yr YyRr
Yyrr
yyRr
yyrr
Genotypic ratio = 1 YYRR : 2 YYRr : 2 YyRR : 4 YyRr : 1 YYrr : 2 Yyrr : 1 yyRR: 2 yyRr : 1 yyrr. None of the genotype appears in 3/16 proportion which makes options B, C and D wrong. Thus, option A is correct.

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