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A Gene for the MN Blood Group Has Codominant Alleles

Question 23

Multiple Choice

A gene for the MN blood group has codominant alleles M and N. If both children in a family are of blood type M, which of the following situations is possible?


A) each parent is either M or MN
B) each parent must be type M
C) both children are heterozygous for this gene
D) neither parent can have the N allele

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