Question

What is a dihybrid cross and give an example of it?

Answer 1

Cross:

1. A cross is referred to as mating between two individuals that leads to the fusion of gametes resulting in the generation of progenies.
2. It is of different types such as - dihybrid, monohybrid, reciprocal cross, back cross, etc.

Dihybrid cross:

1. It is a cross that involves two pairs of contrasting traits of a character.
2. For example- when a cross is made between yellow-round and wrinkled green seeds( both homozygous), plants with only yellow round seeds are seen in the F1 generation but in the F2 generation, four types of combinations are observed.
3. Two of these combinations are similar to the parental combinations and others are new combinations (,i.e. round green and wrinkled yellow)
4. The phenotypic ratio of a dihybrid cross is 9:3:3:1 and the genotypic ratio is 1:2:2:4:1:2:1:2:1.