10. Several genes in humans in addition to
(1) give rise to recognizable antigens on the surface of
red blood cells. The MN and Rh genes are two exam-
ples. The Rh locus can contain either a positive or a
negative allele, with positive being dominant to nega-
tive. M and N are codominant alleles of the MN gene.
The following chart shows several mothers and their
children. For each mother-child pair, choose the father
of the child from among the males in the right col-
umn, assuming one child per male.
a.
b.
C.
d.
Mother
OM Rh(pos)
B MN Rh(neg)
OM Rh(pos)
AB N Rh(neg)
Child
B MN Rh(neg)
ON Rh(neg)
AM Rh(neg)
B MN Rh(neg)
Males
OM Rh(neg)
AM Rh(pos)
O MN Rh(pos)
B MN Rh(pos)