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In an experiment to study… (Class 10 Science 2024, Q10)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 10

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, section A, question 10, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q10 · 1 mark · MCQHeredity

In an experiment to study independent inheritance of two separate traits : shape and colour of seeds, the ratio of the different combinations in progeny would be

  1. (A)1 : 3
  2. (B)1 : 2 : 1
  3. (C)9 : 3 : 3 : 1
  4. (D)9 : 1 : 1 : 3

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Two traits are studied together, so this is a dihybrid cross.

Hint 2

There are 16 combinations in the checkerboard. Group them by phenotype.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. In a dihybrid cross (round yellow × wrinkled green), the plants are all round yellow (RrYy).

  2. Selfing gives the phenotypes round yellow : round green : wrinkled yellow : wrinkled green = 9 : 3 : 3 : 1. This shows independent inheritance. Option (C).

    1 mark

Answer: 9 : 3 : 3 : 1, option (C)

Where the marks are

  • States the dihybrid F2 ratio 9 : 3 : 3 : 1 (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Heredity, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/3/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.