If the father of a foetus is Rh positive and the mother is Rh negative, what are the chances that there will be a mother-foetus incompatibility problem? Assume that the couple already had a first child with no medical problems.

100%

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At least 50%

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Less than 50%

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Solution

The correct option is B At least 50%
If the father is homozygous dominant (DD) the chances of the foetus being Rh positive and an incompatibility problem occurring will be 100%. If the father is heterozygous (Dd), the chances are 50%. There will be no problem if the foetus is Rh negative.

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