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WAEC Biology 2023 Question 42

Question 42

Mendelian Inheritance

A Rhesus negative woman may experience stillbirth of the second child that is Rhesus positive because

  1. A.the woman is susceptible to diseases during pregnancy.
  2. B.the blood of the foetus might clump.
  3. C.they have poor circulatory system.
  4. D.the foetus is deprived of nourishment.
Show the answer and explanation

Answer: B (the blood of the foetus might clump.)

Explanation

After the first Rh-positive baby, the mother makes anti-Rh antibodies. In the next Rh-positive pregnancy these cross the placenta and make the baby's red cells clump and burst.