A cross was made between pure breeding pea plant one with round and green seeds and the other with wrinkled and yellow seeds.
(i) Write the phenotype of `F_(1)` progeny. Give reason for your answer.
(ii) Write the different types of `F_(2)` progeny obtained along with their ratio when `F_(1)` progeny was selfed.

Explanation

(i) The cross was made between round, green seeds and wrinkled, yellow seeds.
In the given cross, two traits were taken into account, which is a dihybrid cross.
Yellow colour and round shape is dominant over green colour and wrinkled shape.

The above cross shows round and yellow seeds in the `F_(1)` generation. It occurs because dominant traits (round and yellow) express itself, whereas recessive traits (wrinkled and green) get suppresed.
(ii) On selfing of `F_(1)` generation :

Phenotypic ratio `-9:3:3:1`
Round yellow - 9`" "`Round green - 3
Wrinkled yellow - 3 `" "` Wrinkled green - 1