Final answer:
A patient with no A or B antigens on their erythrocytes and with anti-A and anti-B antibodies has type O blood, making them a universal donor.
Step-by-step explanation:
A patient who has neither type A or B antigens on the surface of their erythrocytes and produces anti-A and anti-B antibodies has type O blood. People with type O blood lack both antigen A and antigen B on their erythrocytes. Instead, their plasma contains both anti-A and anti-B antibodies, which are known as isohemagglutinins. These antibodies will react with any A or B antigens they come into contact with, which is why type O individuals are known as the universal donors; their blood can safely be given to people with any ABO blood type since it lacks A and B glycoprotein antigens.