- A Two alleles of the exact same gene happen to interact
- B One gene masks or modifies the expression of another gene
- C All genes in the genome act largely independently of each other
- D Genes located on the same chromosome generally do not interact
Correct answer: B. One gene masks or modifies the expression of another gene
Explanation: Epistasis: one gene (epistatic) suppresses or modifies the phenotype of another gene (hypostatic). Causes modified ratios (e.g., 9:3:4, 9:7, 12:3:1 instead of 9:3:3:1).
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 →