CBSE Class 10 Answered

1) Maternal chromosomes are the chromosomes received from your mother and paternal ones are those  received from your father.

There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells:

• Group A – has only the A antigen on red cells (and B antibody in the plasma)
• Group B – has only the B antigen on red cells (and A antibody in the plasma)
• Group AB – has both A and B antigens on red cells (but neither A nor B antibody in the plasma)
• Group O – has neither A nor B antigens on red cells (but both A and B antibody are in the plasma)

In addition to the A and B antigens, there is a third antigen called the Rh factor, which can be either present (+) or absent ( – ), designated as Rh +ve or Rh –ve.