NEET 2006 Biology question

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F generation of the cross RRYY rryy ?

(1)Only round seeds with green cotyledons
(2)Only wrinkled seeds with yellow cotyledons
(3)Only wrinkled seeds with green cotyledons
(4)Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledonsCorrect

Answer: (4)

Solution

RRYY x rryy gives an F1 that is all RrYy (round, yellow). Selfing the F1 gives the F2 in the dihybrid ratio 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green, i.e. all four phenotypic classes appear in the F2. Options (1), (2) and (3) claim that only one class (round green,

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Question ID VK-089702