A red-kernelled wheat variety, homozygous for two independent dominant genes, is crossed with a white-kernelled variety homozygous for both recessive genes. What phenotypic ratio appears in the F2 generation?
Correct answer A. 1:4:6:4:1
Explanation
Kernel colour here is controlled by two additive polygenes, so F2 classes depend on the number of dominant alleles (4, 3, 2, 1 or 0), giving a 1:4:6:4:1 ratio.
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