Question

A cross was made between pure breeding pea plants, one with round and green seeds and the other with wrinkled and yellow seeds? 1. write the phenotype of F1 progeny give reason for your answer

Answer 1

all will be round green in colour

Answer 2

The round shape and yellow colour of seed is dominant over the wrinkled shape and green colour of seed in pea plant as observed by Mendel. Suppose R and Y denote dominant trait and r and y denote recessive trait. 
Genotype of the parent plant with round and green seeds – RRyy
Genotype of the parent plant with wrinkled and yellow seeds – rrYY
Therefore, the cross involved in the given question is the above figure.
i) The phenotype of F1 progeny will be All plants with round shaped and yellow coloured seeds due to the presence of dominant alleles for round shaped and yellow colour.

ii) The different types of F2 progeny obtained are as under:

Phenotypic ratio − 9:3:3:1

Round yellow − 9

Round green − 3

Wrinkled yellow − 3

Wrinkled green −1

Hope this information will clear your doubts about cross between pure breeding pea plants with round and green seeds and other with wrinkled and yellow seeds.

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