Question

In a cross between red kernelled and white kernelled varieties of wheat showing polygenic inheritance the phenotypic ratio in $F_2$ generation will be.

• A. $1:6:15:20:15:6:1$
• B. $1:4:6:4:1$
• C. $1:2:1$
• D. $2:1$

Answer 1

Answer: (B)

$1:4:6:4:1$

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 F${}_2$ generation is '1 : 4 : 6 : 4 : 1'.

So, the correct option is '1 : 4 : 6 : 4 : 1'.