Which infant is most likely to have Rh incompatibility?
a. Infant of an Rh-negative mother and a father who is Rh positive and homozygous
for the Rh factor
b. Infant who is Rh negative and whose mother is Rh negative
c. Infant of an Rh-negative mother and a father who is Rh positive and heterozygous
for the Rh factor
d. Infant who is Rh positive and whose mother is Rh positive
A
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A If the mother is Rh negative and the father is Rh positive and homozygous for
the Rh factor, all the offspring will be Rh positive. Only Rh-positive offspring of
an Rh-negative mother are at risk for Rh incompatibility.
B Only the Rh-positive offspring of an Rh-negative mother are at risk.
C If the mother is Rh negative and the father is Rh positive and heterozygous for
the factor, there is a 50% chance that each infant born of the union will be Rh
positive and a 50% chance that each will be born Rh negative.
D There is no risk for incompatibility with this scenario.
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