Blood bank of the body or reservoir where the blood is stored and can be mobilized, is

Cytoplasmic male sterility in maize is manifestation of interaction between

$A$ : Occasionally mammary glands are functional in males and the condition is called gynaecomastia.

$R$ : Decreased testosterone in later life may also lead to gynaecomastia. It is usually due to perturbation of estrogen to androgen ratio.

Mark the correct statement (w.r.t. sickle cell-anaemia)

In man, four phenotypes of blood groups are due to the presence of antigen-$A$ and antigen-$B$ on the $RBC.$ The chromosome that has the gene to control these antigens is