Polygenic traits are controlled by two or more genes.

Polygenic traits are controlled by two or more genes.

• A. False
• B. They are controlled by a single gene
• C. They are always discrete with no variation
• D. True

Answer: (A)

Polygenic inheritance involves multiple genes contributing to a single trait. Because several genes add their effects, the phenotype tends to appear on a continuous spectrum rather than in just a few separate categories. Each gene’s alleles combine in many possible ways, creating a range of outcomes, and environmental factors can further influence the result. That’s why many quantitative traits, like height or skin color, show gradual variation across individuals. So the statement is true: polygenic traits are controlled by two or more genes. The idea that they’re governed by a single gene or that they’re always discrete with no variation doesn’t fit how these traits typically behave.

Polygenic inheritance involves multiple genes contributing to a single trait. Because several genes add their effects, the phenotype tends to appear on a continuous spectrum rather than in just a few separate categories. Each gene’s alleles combine in many possible ways, creating a range of outcomes, and environmental factors can further influence the result. That’s why many quantitative traits, like height or skin color, show gradual variation across individuals. So the statement is true: polygenic traits are controlled by two or more genes. The idea that they’re governed by a single gene or that they’re always discrete with no variation doesn’t fit how these traits typically behave.