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Mention one advantage and… (Class 12 Biology 2024, Q17b)

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BiologyCBSE Class 12 · Board exam 2024, set 57/5/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2024: question 17(b)

Set in the CBSE Class 12 board exam of 2024, paper 57/5/1, section B, question 17(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q17(b) · 2 marks · Very short answerReproductive Health

Mention one advantage and one disadvantage of amniocentesis.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 57/5/1.

Hints

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

Hint 1

Amniocentesis examines cells from the fluid surrounding the foetus. What can be learnt from their chromosomes?

Hint 2

Which piece of information from the chromosomes can be misused socially?

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. Advantage: Amniocentesis tests the foetal cells present in the amniotic fluid. It can detect chromosomal abnormalities or genetic disorders in the foetus, such as Down's syndrome, haemophilia or sickle-cell anaemia, and helps assess the survivability of the foetus.

    1 mark

  2. Disadvantage: The same test reveals the sex of the foetus. It is misused for sex determination, which can lead to female foeticide. For this reason it is legally banned for that purpose.

    1 mark

Answer: Advantage: detects genetic or chromosomal disorders (e.g. Down's syndrome) in the foetus. Disadvantage: misused for foetal sex determination, leading to female foeticide.

Where the marks are

  • One correct advantage, e.g. detecting genetic disorders such as Down's syndrome (1 mark)
  • Disadvantage: misuse for sex determination leading to female foeticide (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Reproductive Health, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 57/5/1: 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.