JAMB Biology 2002 Question 49

Question 49

Mendelian Inheritance

Genetic counselling is important when a marriage is planned between a

A.Rh⁻ woman and Rh⁺ man
B.Rh⁻ woman and Rh⁻ man
C.Rh⁺ woman and Rh⁺ man
D.RH⁺ woman and RH⁻ man.

Show the answer and explanation

Answer: A (Rh⁻ woman and Rh⁺ man)

Explanation

If an Rh-negative mother carries an Rh-positive baby, her body can make antibodies that attack the red blood cells of a later Rh-positive baby. So this couple needs counselling.