Q. A pea plant having violet coloured flowers with unknown genotype was crossed with a plant having white coloured flowers, in the progeny 50% of the flowers were violet and 50% were white. The genotypic constitution of the parent having violet coloured flowers was :

Q. A pea plant having violet coloured flowers with unknown genotype was crossed with a plant having white coloured flowers, in the progeny 50% of the flowers were violet and 50% were white. The genotypic constitution of the parent having violet coloured flowers was :

(a) Homozygous

(b) Merozygous

(c) Heterozygous

(d) Hemizygous

Solution :

Correct option : C 
The cross between violet-flowered plant and white-flowered plant: Vv (violet) X vv (white)F1 – Vv, Vv, vv, vv So, the phenotypic ratio is 1 violet : 1 white. So, the genotypic constitution of the parent having violet-coloured flowers was heterozygous(Vv).