Blood types are determined by the presence or absence of three antigens: A antigen, B antigen, and an antigen called the Rh factor. The resulting blood types are classified as follows:
type A if the A antigen is present
type B if the B antigen is present
type AB if both the A and B antigens are present
type O if neither the A nor the B antigen is present
These types are further classified as Rh-positive if the Rh-factor antigen is present and Rh-negative otherwise.
(a) Draw a Venn diagram that illustrates this classification scheme.
(b) Identify the blood type determined by each region of the Venn diagram (such as A+ to indicate type A, Rh-positive).
(c) Use a library or another source to find what percentage of the U.S. population has each blood type?