IMMUNOLOGY

Detailed explanation-1: -clonal selection: An hypothesis which states that an individual lymphocyte (specifically, a B cell) expresses receptors specific to the distinct antigen, determined before the antibody ever encounters the antigen. Binding of Ag to a cell activates the cell, causing a proliferation of clone daughter cells.

Detailed explanation-2: -T cells can wipe out infected or cancerous cells. They also direct the immune response by helping B lymphocytes to eliminate invading pathogens. B cells create antibodies. B lymphocytes, also called B cells, create a type of protein called an antibody.

Detailed explanation-3: -There are primary and secondary organs involved in the complex development of lymphocytes, but in most cases, B-and T-lymphocytes are generated in bone marrow and in the thymus.