Question

Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) $\times$ aabbcc (light colour) in $F_2$-generation. What proportion of the progeny is likely to resemble either parent?

• A. Half
• B. Less than 5 percent
• C. More than 5 percent
• D. None of these

Answer 1

The correct option is B Less than 5 percent

Polygene results in polygenic inheritance or quantitative inheritance. In quantitative inheritance, the dominant alleles have cumulative effect, with each dominant allele expressing a part of functional polypeptide and full trait is shown when all the dominant alleles are present. In case of crossing between AABBCC (dark colour) and aabbcc (light colour), in F2F2, i.e., less than 5%.