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Sex is determined by different… (Class 10 Science 2026, Q6)

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ScienceCBSE Class 10 · Board exam 2026, set 31/1/1 · 1 mark · MCQ

CBSE Class 10 Science 2026: question 6

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q6 · 1 mark · MCQHeredity

Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings?
(i) Gamete carrying X chromosome from female parent.
(ii) Gamete carrying X chromosome from male parent.
(iii) Gamete carrying Y chromosome from male parent.

  1. (A)(ii) and (iii)
  2. (B)(i) only
  3. (C)(i) and (iii)
  4. (D)(iii) only

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/1/1.

Hints

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

Hint 1

Which parent can produce two different kinds of gametes?

Hint 2

The mother always gives an X chromosome.

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. A woman is XX, so every egg carries an X chromosome. A man is XY, so half his sperms carry X and half carry Y.

  2. Sex of the child depends on the sperm. An X-carrying sperm from the father gives a girl (XX). A Y-carrying sperm from the father gives a boy (XY). So the deciding gametes are (ii) and (iii). Correct option: (A).

    1 mark

Answer: (A) (ii) and (iii)

Where the marks are

  • Chooses (A) (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 paper2026 board paper, set 31/1/1: 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.