Question

Given below is a schematic diagram showing Mendel’s Experiment on sweet pea plants having axial flowers with round seeds (AARR) and Terminal flowers with wrinkled seeds (aarr). Study the same and answer the questions that follow :

(i) Give the phenotype of F₁ progeny.
(ii) Give the phenotypes of F₂ progeny produced upon by the self-pollination of F₁ progeny.
(iii) Give the phenotypic ratio of F₂ progeny.
(iv) Name and explain the law induced by Mendel on the basis of the above observation.

Answer 1

(i) Axial round
(ii) Axial round, axial wrinkled, terminal round, terminal wrinkled.
(iii) 9:3:3:1
(iv) Law of independent assortment: When there are two pairs of contrasting characters, the distribution of factors of each pair in the gametes is independent of the distribution of other pairs of characters.