Question

A cross was 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 F2 progeny. Answer the following

questions:

(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?”​

Answer 1

Answer:

(a) When tall plants were crossed with the dwarf pea plants in the Mendel's experiment, then in the first generation i.e. F1 progeny, only tall plants were obtained and no dwarf plant was obtained.

(b) In F2 progeny, there were both tall and dwarf pea plants. The ratio of dwarf and pea plants was found to be 3:2

(c) In F2 progeny, there were both tall and dwarf pea plants. The ratio of dwarf and pea plants was found to be 3:2 which confirmed that in F2 progeny, both the characteristics were inherited and the tall character of pea plant was found to be dominative and dwarf to be recessive. This was the law of segregation which says that when plants of different traits were crossed, then in the first progeny only the dominant character was observed whereas in F2 progeny both dominant and recessive traits were obtained.