Question

A pea plant which is homozygous for green pods which are inflated (GGII) is crossed with a homozygous plant for yellow pod which are constricted (ggii).

Answer the following questions:

1. Give the phenotype and genotype of the 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

1. Phenotype: All plants with green coloured pods and an inflated pod shape. 
   Genotype: All plants with GgIi.
2. 9 : 3 : 3 : 1
3. GI, Gi, gI, gi
4. Mendel’s law of segregation of gametes states that when a pair of contrasting alleles come together due to hybridization in a hybrid individual, the two characters remain together without mixing or losing their purity. They segregate (separate) in the gametes of the hybrid.
5. Pisum sativum