Question

Name the cross in which the following phenotypic ratio in F₂ generation is obtained - 9:3:3:1.

Answer 1

Dihybrid cross.

1. When cross is made considering two characters at a time, it is called as dihybrid cross.
2. A dihybrid cross is a breeding experiment between two organisms which are identical hybrids for two traits.
3. In other words, a dihybrid cross is a cross between two organisms, with both being heterozygous for two different traits.
4. A cross is made between homozygous yellow round seeds(YYRR) to another homozygous green wrinkled seeds(yyrr).
5. In the F1 generation, all plants are heterozygous yellow round(YyrRr).
6. When this plant is subjected to self pollination, in the F2 generation, 9 plants are Yellow round, 3 plants are yellow wrinkled, 3 plants are green round and 1 plant is green wrinkled are formed.
7. This called Dihybrid phenotypic ratio 9:3:3:1.