Question

In one of his dihybrid crosses, Mendel crossed a true breeding double dominant pea plant with round and yellow seeds with true breeding double recessive plant having wrinkled and green seeds. The phenotypic ratio got was 9:3:3:1. Using checker board, try to find out the genotypic ratio.

Answer 1

Phenotypic ratio – 

. Round yellow – 9

2. Round green – 3

3. Wrinkled yellow – 3

4. Wrinkled green -1

Phenotypic ratio – 9:3:3:1

Dihybrid genotypic ratio is 1:2:2:4:1:2:1:2:1