The difference between the blood-types is the presence of certain antigens on the surface of the blood cell. These molecules are too small to be seen through a microscope.
The "positive/negative" part is about another antigen on the surface of the cell, which is determined by another gene than the ABO system.
neuralnetwork17 t1_j472v2w wrote
Reply to Is there physical differences between blood types? by terrip_t1
The difference between the blood-types is the presence of certain antigens on the surface of the blood cell. These molecules are too small to be seen through a microscope. The "positive/negative" part is about another antigen on the surface of the cell, which is determined by another gene than the ABO system.