Question

A tall pea plant was crossed with a dwarf one. F1 generation was allowed to self pollinate and F2
generation was also obtained. Answer the following questions:
a. What would be the phenotype of plants in F1 generation?
b. What would be the phenotypic ratio in F2 generation?
c. Give reason for your observation in F1 generation.

Answer 1

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Answer 2

A homozygous tall plant when crossed with a homozygous dwarf plant the F1 progeny would have heterozygous tall plants.

Explanation:

(a) The phenotype of the plants in F1 generation would be two Tall plants (Tt).

(b) The phenotypic ratio of F2 generation would be 3:1. Three tall plants and one dwarf plant.

(c) F1 generation is obtained from crossing one homozygous tall plant (TT) with a homozygous dwarf plant (tt). When gametes  T and t  crossed they form two tall plants, phenotypically. Both are genotypically heterozygous tall plants.

• When homozygous plants are crossed with a homozygous plant of a different trait, they form heterozygous plants where the dominant trait is expressed but carries a gene for the recessive trait.
• The recessive traits get expressed on self-pollination. In F1 generation both the plants produced are tall plants. In F2 generation only one plant with the recessive trait (dwarf plant) is found whereas there are three plants with the dominant trait (tall plant) are found.