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Question

When a pure strain of tall plants (TT) with round seeds (RR) is crossed with a pure strain of short plants (tt) with wrinkled seeds (rr), an F1 generation is produced. The alleles for short and wrinkled are recessive to those for tall and round, respectively. When these F1 plants self-pollinate, what proportion of the F2 generation is short with wrinkled seeds?

A
0
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B
116
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C
12
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D
916
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Solution

The correct option is B 116
Dihybrid cross is the one which involves two pairs of contrasting traits. Mendel found that a cross between tall round and wrinkled short seeds produced only round and tall seeds in F1 generation but in F2 generation the combination observed are
Round tall 9 parental combinations
Round short 3 parental combinations
Wrinkled tall 3 parental combination
Wrinkled short 1 parental combination
So, the correct option is '1/16'

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