Question

In quantitative inheritance, when a character is controlled by two pairs of genes, the ratio obtained in F${}_2$ generation is

• A. 1 : 2 : 1
• B. 1 : 4 : 6 : 4 : 1
• C. 9 : 3 : 3 : 1
• D. 1 : 6 : 15 : 20 : 15 : 6 : 1

Answer 1

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

• Skin color is quantitative or polygenic inheritance. Consider a cross between a negro and a white.
• The offsprings born in the F${}_2$ generation will be 1 negro, 4 dark, 6 medium, 4 light and 1 white skinned.

So, the correct answer is option B.