Biology - Body Fluids and Circulation Question with Solution | TestHub

Haemolytic disease of the newborn (erythroblastosis fetalis) occurs when an Rh-negative mother carries an Rh-positive fetus.

This situation arises when an Rh-negative woman marries an Rh-positive man and the fetus inherits the Rh-positive trait from the father.

During the first pregnancy, the mother's immune system may be exposed to the Rh-positive fetal blood and produce anti-Rh antibodies. In subsequent pregnancies with an Rh-positive fetus, these antibodies can cross the placenta and destroy the fetal red blood cells, leading to haemolytic disease.

Answer: Rh-ve woman marries Rh+ve man.