Question

A true breeding pea plant homozygous for axial violet flowers (AAVV) is crossed with terminal white flowers (aavv).

i. What would be the phenotype and genotype of F₁ and F₂ generations?

ii. Give the phenotypic ratio of F₂ generation.

iii. List Mendel’s generalisation that can be derived from the above cross.

Answer 1

Phenotype of F₁ generation – All Axial Violet

Genotype of F₁ generation – AaVv

F₂ phenotypic ratio → 9 Axial Violet; 3 Axial White; 3 Terminal Violet, 1 Terminal White.

iii. Mendel proposed “The law of independent assortment” from the above cross.

In a dihybrid cross, the segregation of one pair of traits is independent of the other.