Answer: a single gene affects several traits.
- A two genes together control one single trait
- B many genes add up to control one trait
- C a single gene affects several traits
- D the environment alone controls the trait
Correct answer: C. a single gene affects several traits
Explanation: In pleiotropy one gene influences multiple phenotypic characters, as seen in phenylketonuria where a single gene defect affects several traits.
Punnett square for a monohybrid cross between two heterozygous (Tt) parents, showing the 3:1 phenotypic ratio predicted by Mendel's Law of Segregation.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →