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ICSE Class 10 Biology Question 6 of 7

Long Answer Questions — Question 6

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Question 58

Two heterozygous pea plants having round seeds (Rr) are crossed with each other.

(a) Write the Phenotypic ratio of the offspring.

(b) What will the genotypic ratio of the offspring be?

(c) Which of the above two traits is recessive?

Answer

Punnett square for the cross is shown below:

GameteRr
RRRRr
rRrrr

(a) Phenotypic ratio — 3 : 1

(b) Genotypic ratio — 1 : 2 : 1

(c) Wrinkled seeds (rr) is the recessive trait.