At 1:00 a .m ., someone breaks a window in the back of a store and robs the safe . On the way out, the thief is cut on a piece of broken glass . A forensic team collects and tests a sample of blood left behind by the thief . It is O– . The police bring in a suspect with a cut forearm who was arrested just three blocks from the store . The person resembles someone seen leaving the store at the time of the robbery . A sample of the suspect’s blood is taken and tested for blood type . Once the suspect’s blood is mixed with anti-A serum, it is immediately clear that the suspect is not the person who was cut on the broken glass in the store . How did the test indicate that fact?
At 1:00 a .m ., someone breaks a window in the back of a store and robs the safe . On the way out, the thief is cut
on a piece of broken glass . A
O– . The police bring in a suspect with a cut forearm who was arrested just three blocks from the store . The
person resembles someone seen leaving the store at the time of the robbery . A sample of the suspect’s blood is
taken and tested for blood type . Once the suspect’s blood is mixed with anti-A serum, it is immediately clear
that the suspect is not the person who was cut on the broken glass in the store . How did the test indicate that
fact?
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