Which of the following couples was suggested by doctors to not to have more than one child?
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Rh+ male and Rh- female
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Rh- male and Rh+ female
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Rh+ male and Rh+ female
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Rh- male and Rh- female
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None of the above
A
Correct answer
Explanation
Rh type mother-fetus incompatibility occurs only when an Rh+ man fathers a child with an Rh- mother. The first time an Rh- woman becomes pregnant, there usually are not incompatibility difficulties for her Rh+ fetus. However, the second and subsequent births are likely to have life-threatening problems for Rh+ fetuses.