CBSE Class 10 Science 2020 · Paper 31/2/2 · Question 21

Heredity 3 marks Medium

(a)Why did Mendel carry out an experiment to study inheritance of two traits in garden-pea ?
(b)What were his findings with respect to inheritance of traits in $F_{1}$ and $F_{2}$ generation ?
(c)State the ratio obtained in the $F_{2}$ generation in the above mentioned experiment.

Answer

Two traits are inherited independently; $F_{1}$ shows both dominant forms, and $F_{2}$ gives new combinations in the ratio $9 : 3 : 3 : 1$ .

(a) To find out whether two different traits, such as seed shape and seed colour, are inherited together or independently of each other; the cross showed that they are inherited independently (independent inheritance of traits). (b)

F_{1}

: all the plants showed the dominant form of both traits, round and yellow seeds.

F_{2}

: the parental combinations (round yellow, wrinkled green) reappeared along with new combinations (round green, wrinkled yellow). (c)

9 : 3 : 3 : 1

(round yellow : round green : wrinkled yellow : wrinkled green).

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CBSE Class 10 Science 2020 · Paper 31/2/2, Question 21 — all 30 questions with answers →

CBSE Class 10 Science 2020 · Paper 31/2/2 · Question 21

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