Question

Gregor Mendel used true-breeding pea lines to conduct his hybridisation experiments in garden pea. (a) Explain what is meant by true-breeding pea lines. (b) State the three important points of law of dominance as proposed by Gregor Mendel.

In a pea plant (Pisum sativum), green pod colour is dominant over yellow pod colour. The expected ratio of the phenotypes of the offsprings (F₁) in a cross between parents with heterozygous green pod colour and homozygous yellow pod will be :

A dwarf pea plant was treated with gibberellic acid and it becomes as tall as a tall pea plant. If these treated pea plants are crossed with pure tall pea plants, the phenotypic ratio in F₁ generation will be :