What physiological circumstances lead to...

What physiological circumstances lead to erythroblastosis foetalis ?

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### Step-by-Step Solution: 1. **Understanding Blood Groups**: Blood groups are classified based on two systems: ABO and Rh. The Rh factor is particularly important in pregnancy and blood transfusions. 2. **Rh Factor Explanation**: Individuals with the Rh antigen on their red blood cells (RBCs) are classified as Rh positive (Rh+), while those without it are Rh negative (Rh-). 3. **Formation of Antibodies**: If an Rh- individual is exposed to Rh+ blood, their immune system will recognize the Rh antigen as foreign and produce antibodies against it. This is a crucial point in understanding erythroblastosis fetalis. ...

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In erythroblastosis foetails,

Rh antibodies pass from the Rh(+ve) mother into the Rh(-ve) baby through the placenta .

Rh antibodies pass from the Rh(-ve) mother into the Rh(+ve) baby through the placenta.

Rh antigens pass from the Rh(-ve) mother into the Rh(+ve) baby through the placenta.

Rh antigens pass from the Rh(+ve) mother into the Rh(-ve) baby through the placenta.

Erythroblastosis foetalis occurs

When the mother is Rh negetive and the child is Rh positive

When the father and child are both negative, but the mother is positive

When the mother and child are both Rh positive, but the father is Rh negative

When the mother and father are Rh positive, but child is Rh negative

Erythroblastosis foetalis occurs:

when the mother is Rh negative and the child is Rh positive

when the mother is Rh negative and the child is Rh negative

when the mother is negative and the child is positive

when the mother is Rh positive and the child is Rh negative