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GS Paper IUPSC Prelims 2002
Health & Medicine
Question No. 455Interactive Test Mode
00:00
+2-0.66

Q455. When one gene controls two or more different characters simultaneously, the phenomenon is called:

When one gene controls two or more different characters simultaneously, the phenomenon is called:

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2002 • Science and Technology

Correct Answer: Option (B) — Pleiotropy

Concept & Option Breakdown

Standard Reference Verified

Pleiotropy refers to the genetic phenomenon where a single gene influences multiple, distinct, and seemingly unrelated phenotypic traits (e.g., the sickle-cell gene affecting erythrocyte morphology, malaria resistance, and tissue oxygenation).

Elimination Heuristic & Exam Approach

Definitions: One gene -> multiple traits = Pleiotropy; Multiple genes -> one trait = Polygenic inheritance.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2002 (Q455)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — Pleiotropy

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Frequently Asked Questions — UPSC Prelims 2002 Q455

What is the official answer for UPSC Prelims 2002 GS Paper I Question 455 (Science and Technology)?

The official UPSC answer key for this 2002 Science and Technology (Health & Medicine) question is Option (B): "Pleiotropy". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2002 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine 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 Health & Medicine UPSC Prelims question using option elimination?

Definitions: One gene > multiple traits = Pleiotropy; Multiple genes > one trait = Polygenic inheritance.

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