NEET 2023 · Class 12

Principles of Inheritance and Variation

The phenomenon of pleiotropism refers to

  1. (A)Presence of two alleles, each of the two genes controlling a single trait
  2. (B)A single gene affecting multiple phenotypic expression
  3. (C)More than two genes affecting a single character
  4. (D)Presence of several alleles of a single gene controlling a single crossover

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
13 of 13

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 'a single gene can exhibit multiple phenotypic expression,' which directly matches and conclusively proves option B.

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 2023 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.