Ques 17


(a) If we cross pure bred tall (dominant ) pea plant with pure bred dwarf (recessive) pea plant we will get pea plants of F_l generation. If we now self cross the pea plant of F₁ generation then we obtain pea plants of F₂ generation.
 
a) What do the plants of F_l generation look like? 
b) State the ratio of tall plants to dwarf plants in F₂ generation. 
c) State the type of plants not found in F_l generation but appeared in F₂ generation mentioning the reason for the same. 
d) Mention the genotypes of 2 Different traits related to pea seed.

Below is the cross between pure breed tall (dominant) pea plant with pure breed dwarf (recessive) pea plant as well as the self-cross between the pea plant of F1 generation.

a.
In F1 generation, all plants are tall (Tt)  indicating that tall trait is dominant. It suggests that T is dominant over t and only one allele of the trait is sufficient to express the dominant character.

b.
3(tall):1(dwarf).

c.
In F2 generation, dwarf plants (tt) appear in addition to tall plants (TT, Tt). These dwarf plants do not found in F1 generation. It suggests, t is recessive and both the alleles of the recessive trait should be present (homozygous form, tt) in the plant in order to express the recessive character.

d.
The genotypes of two different traits related to pea plant are: Homozygous Round seed (RR) and homozygous wrinkled seed(rr).

Regards.