Apentix/AP Biology/Unit 5: Heredity/Question
AP Biologymediummcq1 pt

A quantitative trait is influenced by many genes and by environmental variation. Which phenotype pattern is most likely in a large population?

A.A continuous range of phenotypes, often approximating a bell-shaped distribution when many small effects combine
B.Two discrete categories
C.A single intermediate value
D.No variation at all

Explanation

Core Concept

When many loci contribute small additive effects and the environment also influences phenotype, individuals often span a continuous range rather than falling into a few discrete categories. Such distributions are frequently approximately normal, but polygenic inheritance does not guarantee a perfect bell-shaped curve.

Correct Answer

AA continuous range of phenotypes, often approximating a bell-shaped distribution when many small effects combine

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