A Gene for the MN Blood Group Has Codominant Alleles

question 42

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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