Prothrombin,which helps in the clotting of blood,is present in:

If the foetus is $Rh^+$ and the mother is $Rh^-$,then:

$A$ person with antigen $A$ in $RBC$ and antibody $b$ in plasma belongs to blood group

$A$ person injured in a road accident does not have a known blood group and requires an immediate blood transfusion. $A$ doctor friend offers to donate blood immediately. What would be the blood group of this doctor?

The problem due to $Rh$ factor arises when the blood of two individuals ($Rh^+$ and $Rh^-$) mix up in which of the following conditions?

Which type of white blood cells are associated with the release of histamine and the natural anticoagulant heparin?