CHE113SER4

CHE113SER4 - CHE113 Forensic Science Nicolas Canel Forensic...

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CHE113 Forensic Science Nicolas Canel Forensic Serology Blood Types -Karl Landsteiner, 1900 -Noted that when blood from different people is mixed it sometimes forms precipitate - deadly if mixed in body. Explored why. -A blood group or blood type is based on the presence or absence of two proteins (A, B antigens) on the surface of red blood cells. Because two proteins are involved, there are four possible combinations or blood types (ABO groups): * Type A - Only the A protein is present. * Type B - Only the B protein is present. * Type AB - Both proteins are present. Type O - Neither protein is present. -In addition to the A and B proteins, there is another protein called the Rh factor (Rh for Rhesus monkey, where it was first identified). The Rh factor is either present (+) or absent (-). Therefore, blood types are described as the type and Rh factor (such as O+ , A+, AB-). U.S. Blood-type Distribution O+ 38 percent of population A+ 34 percent of population B+ 9 percent of population O- 7 percent
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CHE113SER4 - CHE113 Forensic Science Nicolas Canel Forensic...

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