Question

A pea plant which is homozygous for green pods which are inflated [GGII] is crossed with a homozygous plant for yellow pods which are constricted [ggii]. Answer the following questions:

1. Give the phenotype and genotype of the F₁ generation.
   Which type of pollination has occurred to produce F₁ generation?
2. Write the phenotypic ratio of the F₂ generation
3. Write the possible combinations of the gametes that can be obtained if two F₁ hybrid plants are crossed.
4. State Mendel’s law of ‘Segregation of Gametes’.
5. What is the scientific name of the plant which Mendel used for his experiments on inheritance?

Answer 1

a)

1. Phenotype of F₁ generation: Pea plants with green and inflated pods.
2. A genotype of F₁ generation: GgIi
3. Artificial cross-pollination has occurred to produce the F₁ generation

b)  The phenotypic ratio of the F₂ generation is 9 : 3 : 3 : 1.

c) GI, Gi, gI, gi

d) The two members of a pair of factors separate during the formation of gametes. This is Mendel’s law of ‘Segregation of Gametes’.

e) Pisum sativum