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Erythroblastosis foetalis occurs:...

Erythroblastosis foetalis occurs:

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### Step-by-Step Solution: 1. **Understanding Erythroblastosis Fetalis**: Erythroblastosis fetalis is a condition that occurs during pregnancy when there is an incompatibility between the blood types of the mother and the fetus, specifically regarding the Rh factor. 2. **Rh Factor Basics**: The Rh factor is a protein known as the rhesus antigen that can be present on the surface of red blood cells (RBCs). Individuals who have this antigen are classified as Rh positive (Rh+), while those who do not have it are classified as Rh negative (Rh-). 3. **First Pregnancy**: In the first pregnancy, if the fetus is Rh positive and the mother is Rh negative, the mother’s immune system typically does not react because the fetal blood is not exposed to the mother’s blood during pregnancy. ...
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In erythroblastosis foetails,