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(a) What are transgenic… (Class 12 Biology 2024, Q24)

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BiologyCBSE Class 12 · Board exam 2024, set 57/5/1 · 3 marks · Short answer

CBSE Class 12 Biology 2024: question 24

Set in the CBSE Class 12 board exam of 2024, paper 57/5/1, section C, question 24, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q24 · 3 marks · Short answerBiotechnology and its Applications

(a) What are transgenic animals ?
(b) Name the transgenic animal having the largest number amongst all the existing transgenic animals.
(c) State any 3 reasons for which these types of animals are being produced.

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

The word 'transgenic' means carrying a gene from another source.

Hint 2

Which laboratory animal is used most widely in genetic research?

Hint 3

Think of research uses, medicinal products and safety testing.

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) Transgenic animals are animals whose DNA has been manipulated to possess and express an extra (foreign) gene.

    1 mark

  2. (b) Mice – over 95% of all existing transgenic animals are mice.

    ½ mark

  3. (c) Reason 1: to study how genes are regulated and how they affect normal physiology and development.

    ½ mark

  4. (c) Reason 2: to study how genes contribute to the development of diseases, so that transgenic models of human diseases (e.g. cancer, cystic fibrosis) can be used to find new treatments.

    ½ mark

  5. (c) Reason 3: to obtain useful biological products, such as α-1-antitrypsin, or human-protein-enriched milk from the transgenic cow Rosie. Other valid reasons are vaccine safety testing and chemical safety (toxicity) testing.

    ½ mark

Answer: (a) Animals with manipulated DNA that possess and express a foreign gene. (b) Mice. (c) Any three of: study of normal physiology and development, study of disease, biological products, vaccine safety testing, chemical or toxicity testing.

Where the marks are

  • Correct definition of transgenic animals (1 mark)
  • Mice (½ mark)
  • Any three correct reasons (½ mark each)

Revise the chapter

Practise this chapterBoard-style questions from Biotechnology and its Applications, 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.