"Disease"
The chapter begins with Ridley talking about using your DNA fingerprinting and blood sample to solve crimes. Then he started talking about blood transfusion and how transferring the wrong type of blood could be fatal. Blood types we first discovered in the 1900s, the first three types are A,O, and B. It was in the 1920s that blood type groups were organized and in the 1990s that genes had to do with the blood. Ridley gave examples about sickle cell disease and malaria diseases. He told the reader that the disease have been inherited to the newer generations and the code for that disease can either be dormant or active.
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