Question

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

(i) Write the phenotype of F 1 progeny. Give a reason for your answer. 

(ii) Write the different types of F 2 progeny obtained along with their ratio when F 1 progeny was selfed.

Answer 1

i) On crossing pure-breeding pea plants one having round and green seeds and the other having wrinkled and yellow seeds we observe that all the F1 generation plants have round and yellow seeds with the genotype RrYy. 

ii) On selfing the plants obtained on the F1 generation i.e. the plant with the genotype RrYy we obtain 16 type of offsprings in the F2 generation. Their phenotypic ratio is as follows: 

9:3:3:1 (round yellow 9: round green 3: wrinkled yellow 3: wrinkled green 1)