SAT Subject Biology Practice Question 26: Answer and Explanation

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Question: 26

3. Which of these is an example of polygenic inheritance?

A. Epistasis
B. Dominance
C. Segregation
D. Pleiotropy
E. Independent assortment

Correct Answer: A


Polygenic inheritance describes traits that are influenced by multiple genes. Epistasis is an interaction between two genes, both affecting a phenotype. In contrast, pleiotropy occurs when a single gene influ-ences multiple traits.

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