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.

Question

Quizplus · Accepted Answer

If both children are of blood type M, each parent can be either M or MN, as the M allele is codominant and can be passed from either parent.

A Gene for the MN Blood Group Has Codominant Alleles