NEET 1998 · Class 12

Principles of Inheritance and Variation

When a single gene influences more than one trait it is called

  1. (A)pseudodominance
  2. (B)pleiotropy
  3. (C)epistasis
  4. (D)none of these

The NCERT line that answers it

Verbatim line

There are however instances where a single gene can exhibit multiple phenotypic expression.

Chapter
Principles of Inheritance and Variation
Section
4.5 PLEIOTROPY
Page
18
Words matched
21 of 21

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that a single gene can exhibit multiple phenotypic expression, which is the precise definition of pleiotropy, directly matching the MCQ question and distinguishing it from pseudodominance and epistasis.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

Take the free 5-minute checkMore from this chapter

Question text is reproduced from the published NEET 1998 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.