Question

Santosh loved his garden, especially his pea plants. One year, he noticed that all the pea plants he grew from one batch of seeds had round seeds. Curious, he took the seeds from one of those plants and grew a new generation. To his surprise, 75% of the new plants had round seeds, but 25% had wrinkled seeds.

1. What were the genotypes of the parent plants that Santosh originally planted?
2. Which trait is dominant – round or wrinkled seeds?
3. What is the genotypic ratio of the second generation (F₂) plants?

Answer 1

1. Heterozygous dominant – Rr
2. Round seeds
3. 1 : 2 : 1