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Do Q15:

q. A cross whas carried out between a pure bred tall pea plant and a pure bred dwarf pea plant and F₁ progeny was obtained. Later, the F₁ progeny was selfed to obtain F₂progeny. Answer the following question:

(a) What is the phenotype of the F₁ progeny and why ?
(b) Give the phenotypic ratio of the F₂ progeny.
(c) Why is the F₂ progeny different from the F₁ progeny ?

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Solution

Dear student.

a.
Pure tall plant will be (TT) and pure dwarf will be (tt). When they are crossed then the F1 generation will be (Tt) which will be tall.

All F1 plants will be tall as tallness is a dominant character over dwarfness.

b.

F2 generation on selfing plants in F1 generation.

T t

T TT Tt

t Tt tt

We would get 3 tall and one dwarf plant in F2 generation.

c. F2 progeny is different from the F1 progeny as, in case of F2 progeny heterozygous tall plant is considered for the cross, whereas in case of F1, homozygous tall and dwarf plant is considered for the cross.

Regards.

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