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Erythroblastosis foetalis is caused when...

Erythroblastosis foetalis is caused when

A

mother is Rh negative and the foetus is Rh positive

B

father and mother are Rh positive , but the fetus is Rh negative

C

mother is Rh positive and the foetus is Rh negative

D

father, mother , and fetus are all Rh positive

Text Solution

Verified by Experts

The correct Answer is:
A
Multiple alleles determine the human blood types. The common blood types are : A,B,AB and O. Red blood cells of a person classified as "Type A" contain "Agglutinogen A" and their serum contains "Agglutinin b" Type AB contains agglutinogens A and B but no agglutinins . Type O possessses no agglutinogens but the serum carries a+b agglutinins. Rhesus (Rh) agglutinogen is present in humans and is represented by a dominant gene R. The agglutinogen of an Rh positive fetus passes across the placenta , enters the maternal blood stream and elicits the production of an agglutinin (antibody) by the mother . The agglutinin passes into the circulation of the fetus and if present in sufficient concentration can produce agglutination, at times fatal to the developing fetus .
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