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Which of the following is a characteristic of polygenic inheritance?
AThree or more genes contribute to the phenotype, with each allele's effect being additive
BOnly homozygotes express the phenotype
COne gene affects multiple traits
DThe phenotype shows a clear 3:1 ratio
Answer & Solution
Correct answer: A. Three or more genes contribute to the phenotype, with each allele's effect being additive
**Polygenic inheritance** = ≥3 genes affecting one trait; effects are **additive** (each dominant allele adds a small contribution). Produces a continuous gradient, not discrete Mendelian ratios.
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