Mendelian Genetics

AP Biology· difficulty 3/5

A trait is autosomal dominant if

A
$Every affected child has at least one affected parent (no skipping); both sexes equally affected$
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B
$Affected individuals can have two unaffected parents; the trait often skips generations in pedigrees$
C
$Only females display the affected phenotype because expression requires two X chromosomes$
D
$Only males display the affected phenotype; affected fathers always pass the trait to their sons$

Explanation

Dominant traits don't skip generations because heterozygotes express the phenotype.

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