Non-Mendelian Genetics

AP Biology· difficulty 3/5

The ABO blood group is an example of

A
$Polygenic inheritance involving many small-effect loci across the genome$
B
$A two-allele dominant-recessive system at a single locus in the population$
C
$Multiple alleles (Iᴬ, Iᴮ, i) at a single gene locus in the population$
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D
$X-linked inheritance with alleles carried only on the X chromosome$

Explanation

Three alleles exist in the gene pool at this locus; any individual has two of them.

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