Question

When a wheat variety of red kernels is crossed with white kerneled wheat, the F₂ ratio would be (it is a polygenic trait controlled by 2 pairs of polygenes).

• A. 9 : 7
• B. 1 : 10 : 4 : 1
• C. 1 : 4 : 6 : 4 : 1
• D. 1 : 2 : 4 : 2 : 4 : 2 : 1

Answer 1

The correct option is C 1 : 4 : 6 : 4 : 1

(i) Red (extreme) – 1/16

(ii) Dark red – 4/16

(iii) Medium red – 6/16

(iv) Light red – 4/16

(v) White – 1/16

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.