Question

A pea plant with Purple flowers was crossed with a plant with white flowers producing 40 plants with only purple flowers. On selfing these plants produced 470 plants with purple flower 162 with white flowers. What genetic mechanism account for this results ?

Answer 1

F₂ generation 470 purple : 162 white. In F₁ generation only purple flowers producing plants appeared. This means purple colour is dominant. Which doesn’t allow the white colour to express itself.

In F₂ generation, purple and white coloured flowers were produced in the ratio 3:1. Here the parental character of white again reappeared in about one fourth of the progeny. This occurs due to segregation of genes in the gamete formation. This represents the law of segregation and monohybrid ratio.