Multiple choice

In a couple, male is Rh positive and the female is Rh negative, what are the chances that there will be a mother-foetus incompatibility problem? Assume that the couple has already had a child and that there has been no medical treatment to prevent this problem.

  1. 100%

  2. at least 50%

  3. lesser than 50%

  4. 0%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If the father is homozygous dominant (DD) the chances of the fetus 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 fetus is Rh negative.

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