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GS Paper IUPSC Prelims 2000
Biotechnology & Genetics
Question No. 28Interactive Test Mode
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Q28. Assertion (A): “DNA finger printing” has become a powerful tool to establish paternity and identity of criminals in rape and assault cases. Reason (R): Trace evidence such as hairs, saliva and dried semen are adequate for DNA analysis. Codes:

Assertion (A): “DNA finger printing” has become a powerful tool to establish paternity and identity of criminals in rape and assault cases. Reason (R): Trace evidence such as hairs, saliva and dried semen are adequate for DNA analysis. Codes:

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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2000 • Science and Technology

Correct Answer: Option (A) — Both A and R are true and R is the correct explanation of A.

Concept & Option Breakdown

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Assertion (A) is true: DNA profiling allows unique identification of individuals based on variable satellite DNA sequences.

Reason (R) is true: PCR and modern extraction techniques allow nanogram amounts of DNA from biological traces (hair follicles, epithelial cells from saliva, semen) to be analyzed successfully, making it extremely effective in forensic and paternity verification.

Since the adequacy of minute trace biological evidence is precisely why forensic DNA profiling is so powerful, R correctly explains A.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2000 (Q28)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Biotechnology & Genetics
Official Answer KeyOption (A) — Both A and R are true and R is the correct explanation of A.

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Frequently Asked Questions — UPSC Prelims 2000 Q28

What is the official answer for UPSC Prelims 2000 GS Paper I Question 28 (Science and Technology)?

The official UPSC answer key for this 2000 Science and Technology (Biotechnology & Genetics) question is Option (A): "Both A and R are true and R is the correct explanation of A.". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2000 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Biotechnology & Genetics". You can explore all repeated questions from Biotechnology & Genetics in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Biotechnology & Genetics UPSC Prelims question using option elimination?

To solve Biotechnology & Genetics questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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