Erythroblastosis foetalis can occur if

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(A) Erythroblastosis foetalis occurs when there is an $Rh$ incompatibility between the mother and the foetus.Specifically,it happens when the mother i

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

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(A) Erythroblastosis foetalis occurs when there is an $Rh$ incompatibility between the mother and the foetus.Specifically,it happens when the mother is $Rh^{-}$ve and the foetus is $Rh^{+}$ve.During the first pregnancy,the mother's blood is exposed to the $Rh$ antigens of the foetus during delivery,leading to the production of anti-$Rh$ antibodies in the mother's blood.In subsequent pregnancies with an $Rh^{+}$ve foetus,these maternal antibodies can cross the placenta and destroy the foetal $RBCs$,causing severe anaemia and jaundice,a condition known as erythroblastosis foetalis.

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