In Mendel's dihybrid cross the phenotypic ratio was 9 : 3 : 3 : 1. Here 9 indicates
A
Round yellow seeds
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B
Wrinkled green seeds
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C
Wrinkled yellow seeds
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D
Round green seeds
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Solution
The correct option is A Round yellow seeds The cross involving two pairs of contrasting traits is called a dihybrid cross. The two pairs of contrasting traits chosen by Mendel were round/wrinkled shaped and yellow/green coloured seeds. The 9 in the dihybrid ratio represents round and yellow seeds.