Question

The number of recombinant phenotypes formed during $F_2$ generation of dihybrid cross

• A. 6
• B. 10
• C. 4
• D. 2

Answer 1

The correct option is A 6

A dihybrid cross is a cross between two different traits. The first filial generation produces four identical offsprings, the second filial generation, which occurs by crossing the members of the first filial generation, shows a phenotypic ratio of 9:3:3:1, where the 9 represents the proportion of individuals displaying both dominant traits, the first 3 represents the individuals displaying the first dominant trait and the second recessive trait, the second 3 represents those displaying the first recessive trait and second dominant trait and the 1 represents the homozygote, displaying both recessive traits.

Recombinant phenotypes are heterozygotes (yellow, wrinkled and green, round) which are 6 in number as seen in the Punnett square. Thus, option A is correct and other options are wrong.