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(i) What are transgenic… (Class 12 Biology 2024, Q27a)

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

CBSE Class 12 Biology 2024: question 27(a)

Set in the CBSE Class 12 board exam of 2024, paper 57/1/1, section C, question 27(a), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q27(a) · 3 marks · Short answerBiotechnology and its Applications

(i) What are transgenic animals ? (1)
(ii) Name the first transgenic cow and state its importance. (2)

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

Hints

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

Hint 1

'Trans' + 'gene' means a gene brought in from another organism.

Hint 2

The first transgenic cow has a human-sounding name, and her milk contained a human protein.

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. (i) Transgenic animals are animals whose DNA has been manipulated so that they possess and express an extra (foreign) gene.

    1 mark

  2. (ii) The first transgenic cow was Rosie (1997).

    1 mark

  3. (ii) Importance: Rosie produced milk enriched with the human protein alpha-lactalbumin (2.4 g per litre). This milk is nutritionally more balanced for human babies than natural cow milk.

    1 mark

Answer: (i) Animals with manipulated DNA carrying and expressing a foreign gene; (ii) Rosie – produced human alpha-lactalbumin-enriched milk, more balanced for human babies

Where the marks are

  • Definition of transgenic animals (1 mark)
  • Names Rosie (1 mark)
  • Milk with human alpha-lactalbumin, nutritionally better for babies (1 mark)

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 57/1/1: 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.