Non-Mendelian Genetics

AP Biology· difficulty 1/5

Which best describes the phenomenon shown?

A
$Polygenic inheritance: many genes contribute additively to one trait.$
B
$Codominance: heterozygotes display both alleles.$
C
$Pleiotropy: a single gene influences multiple, seemingly unrelated phenotypic traits.$
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D
$Linkage: alleles travel together due to physical proximity.$

Explanation

Pleiotropy occurs when a single gene affects multiple traits (e.g., the CFTR gene affecting lung, pancreatic, and reproductive function in cystic fibrosis).

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