A person with blood group$-A$ has
Antigen$-A$ and Anti$-B$ Antibodies
Antigen$-B$ and Anti$-A$ Antibodies
Both antibodies
No antibody and no antigen
In Cooley's Anemia, the affected chain of a haemoglobin is
Albinism is a congenital disorder resulting from the lack of the enzyme
Assertion : Persons suffering from haemophilia fail to produce blood clotting factor $VIII$.
Reason : Prothrombin producing platelets in such persons are found in very low concentration.
Loss of a $X$ chromosome in a particular cell during its development, results into
Sex linked inheritance was discovered by