When a wheat variety with red kernels (homozygous for two non allelic and independent dominant genes) is crossed with white kenneled wheat (homozygous for two recessive non allelic independent genes), the phenotypic ratio in the F2 generation would be________________?
Correct answer: D. 1:4:6:4:1Government
- A. 9:3:3:1
- B. 9:7
- C. 9:9:9:3:3:3:1
- D. 1:4:6:4:1Government
Explanation
With two additive gene pairs affecting wheat-kernel colour, the F2 classes follow the binomial distribution 1:4:6:4:1, from the two-locus genotype combinations. The 9:7 ratio instead represents complementary gene action with two required dominant genes.
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