Question

Q35. A cross was carried out between a pure bred tall pea plant and a pure bred dwarf pea plant and the F2
Progeny was obtained.
() What is phenotypic ratio ? (1)
(ii) What is genotypic ratio? (1)
(ii) Why was a pea plant used for the experiment 1 (1)
(iv) Explain the monohybrid cross.(2)​

Answer 1

Answer:

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant.

Explanation:

ANSWER

Mendel crossed pure tall plant(TT) with a pure dwarf plant(tt). In the F1 generation, tall plants are formed(Tt). When F1 plant is subjected to self pollination, in the F2 generation, 3 tall plants and 1 dwarf plants are formed. In the one homozygous tall plant (TT), 2 heterozygous tall plants(Tt), one homozygous dwarf plant(tt) are formed. Phenotypic ratio is 3:1, genotypic ratio is 1:2:1.

So, the correct option is ‘1:2:1 – tall homozygous:tall heterozygous:dwarf’.