What physiological circumstances lead to eryt | vedclass

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(B) Erythroblastosis foetalis occurs due to $Rh$ incompatibility between an $Rh^{-ve}$ mother and an $Rh^{+ve}$ foetus.During the first pregnancy,the

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Mother is $Rh^{-ve}$ and foetus is $Rh^{+ve}$

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(B) Erythroblastosis foetalis occurs due to $Rh$ incompatibility between an $Rh^{-ve}$ mother and an $Rh^{+ve}$ foetus.During the first pregnancy,the mother's blood is exposed to the $Rh$ antigens of the foetus,leading to the formation of anti-$Rh$ antibodies in the mother's blood.In subsequent pregnancies,these antibodies can cross the placenta and enter the foetal circulation.These antibodies destroy the foetal $RBCs$,leading to severe anaemia and jaundice,a condition known as erythroblastosis foetalis.

Column-$I$ (Blood Group)	Column-$II$ (Antibodies)
$P$. $A$	$I$. Absent
$Q$. $B$	$II$. $a$ (anti-$B$)
$R$. $AB$	$III$. $b$ (anti-$A$)
$S$. $O$	$IV$. $a, b$ (anti-$A$ and anti-$B$)

What physiological circumstances lead to erythroblastosis foetalis?

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$P$. $A$ $I$. Absent
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$R$. $AB$ $III$. $b$ (anti-$A$)
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