Blood types are further classified as Rh-positive and Rh-negative. Blood Rh-positive are found when there is antigen D, and Rh-negative when antigen D isn’t present. Blood type O+ is the most common blood type, but as the chart above shows, not all racial and ethnic groups have the same percent.
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Blood types are inherited, like your eye color or your hair type. Your blood type depends on your parents. This next chart shows how you can obtain your blood types from your parents.
These are the possible mixtures that you can obtain from your parents. Any other mixtures would depend on the grandparents, which barely matter in inheriting blood types. You can’t donate red blood cells to just any person, your blood types have to be compatible. Certain blood...