Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F₁ generation are then cross-bred to produce F₂ generation of pea plants.

(a) What do the plants of F₁ generation look like ?

(b) What is the ratio of tall plants to dwarf plants in F₂ generation?

(c) Which type of plants were missing in F₁ generation but reappeared in F₂ generation?

In humans, if gene B gives brown eyes and gene b gives blue eyes. What will be the color of eyes of the persons having the following combination of genes?

(a) Bb (b) bb (c) BB

Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F₁ generation but re-emerge in F₂ generation. Which of the plants A and B are : (i) tall, and (ii) dwarf? Give reason for your answer.

A plant has two varieties, one with red petals and the other with white petals. When these two varieties are cross-pollinated, all the offspring have red petals?

(a) Which gene is dominant?

(b) Choose suitable letters to represent the two genes.

A red-haired woman marries a brown-haired man, and all the children are brown haired. Explain this genetically.