A doctor administers anti-Rh antibodies to a woman immediately after the delivery of her first child to protect her future pregnancies. Based on this medical intervention, what must be the Rh blood group status of the mother and her newborn?

Step-by-step solution

Erythroblastosis foetalis is a condition caused by Rh incompatibility when an Rh-negative mother carries an Rh-positive foetus. During the delivery of the first child, the maternal blood may be exposed to a small amount of the Rh-positive blood from the foetus. This exposure causes the mother's immune system to start preparing anti-Rh antibodies, which could cross the placenta and destroy the foetal red blood cells in subsequent pregnancies. To prevent this sensitization, anti-Rh antibodies are administered to the