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Question

A cross was made between pure breeding pea plants one with round and green seeds and the other with wrinkled and yellow seeds

(a) Write the phenotype of F1 progeny. Give reason for your answer.

(b) Write the different types of F2 progeny obtained along with their ratio when F1 progeny was  selfed


Solution

(a) 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 F1 generation. It occurs because dominant traits (round and yellow) express itself, whereas recessive traits (wrinkled and green) get suppressed.

(b) On selfing of F1 generation

Phenotypic ratio - 9:3:3:1

Round yellow - 9

Round green - 3

Wrinkled yellow - 3

Wrinkled green - 1

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