Question

Both phenotypic and genotypic ratio of $F_2$ are same in

• A. Co-dominance
• B. Incomplete dominance
• C. Back cross
• D. Both A and B

Answer 1

The correct option is B Incomplete dominance

In incomplete dominance, a cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits.

Consider an example of red flower and white flower. When they are cross-bred, in F${}_1$ generation all the flowers will be pink (R1 R2). When F${}_1$ generation is self-pollinated, we get one red (R1 R1) flower, two pink (R1 R2) flowers and one white (R2 R2) flower. So the ratio for incomplete dominance is 1:2:1 for both, genotype as well phenotype in F${}_2$ generation.

Thus, the correct answer is 'Incomplete dominance'.