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In humans, three alleles affect blood type. The A and B alleles are
codominant and the O allele is recessive. Which of the following answer
choices is true?

A) The O blood type is least common in the human population.

B)Human blood type is an example of incomplete dominance.

C) The A and B alleles are codominant because both alleles are simultaneously expressed
in the heterozygote.

D)Human blood type is an example of multiple allele inheritance.