AP Biologymediummcq1 pt
Pleiotropy occurs when
A.one gene affects multiple traits
B.many genes affect one trait
C.one gene masks another
D.both alleles are expressed
Explanation
Core Concept
Sickle-cell alleles alter hemoglobin shape AND cause anemia, pain crises, and malaria resistance — one gene, many phenotypic effects.
Correct Answer
Aone gene affects multiple traits
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