Question

If the F2 of a dihybrid cross gives a 9:3:4 ratio, what is the ratio of phenotypes if one takes an F1 individual?

a) 1:2:1
b) 3:1
c) 9:4:3
d) 1:1:1

Answer 1

The ratio of phenotypes in the F1 generation of a dihybrid cross is typically a 3:1 ratio.

Step-by-step explanation:

The 9:3:3:1 ratio in the F2 generation of a dihybrid cross represents the distribution of phenotypes resulting from the combination of two different traits.

To determine the ratio of phenotypes in the F1 generation, we can collapse the dihybrid cross into two monohybrid crosses.

In this case, if we consider each trait separately, we would expect a 3:1 ratio of phenotypes in the F1 individuals.