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Question

In a cross between red kernelled and white kernelled varieties of wheat showing polygenic inheritance the phenotypic ratio in F2 generation will be.

A
1:6:15:20:15:6:1
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B
1:4:6:4:1
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C
1:2:1
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D
2:1
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Solution

The correct option is C 1:4:6:4:1
The kernel colour in wheat is determined by two pairs of genes 'Aa' and 'Bb'. Genes 'A' and 'B' are dominant genes which determine the red colour whereas 'a' and 'b' are recessive alleles. '

As shown in table, phenotypic ratio for F2 generation is '1 : 4 : 6 : 4 : 1'.
So, the correct option is '1 : 4 : 6 : 4 : 1'.

1034078_633716_ans_fe50ca1a7b6e40ffaace28267557e9b4.jpg

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