SAT Subject Biology Practice Question 90: Answer and Explanation

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Question: 90

20. Which of the following patterns of inheritance describes interactions between multiple genes?

A. Epistasis
B. Sex linkage
C. Codominance
D. Simple dominance
E. Homozygous recessive

Correct Answer: A


Epistasis is the condition in which the genotype at one locus affects the expression of a gene at another locus. For example, an allele for a gene for black fur may mask the alleles at another locus, no matter which alleles are present at that locus.

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