Name__________________________________________date_____FS-_____
BLOOD TYPING
Directions: 1. Place 2-3 drops of blood into each of the 3 wells (labeled A B Rh)
2. Place 3-6 drops of anti-A into A, anti-B into B and Rh into Rh
3. Using a different toothpick, stir gently
4. Record blood type for suspect 1,2,3, weapon, CS and victim
weapon
Weapon_____
Questions:
1. Why is simulated (man-made) blood used instead of real human blood in this
activity?(list 2 reasons)
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2. Explain why it is necessary to type the victim’s blood when trying to determine if any of
the blood found at the crime scene belongs to a particular suspect.
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3. List all of the blood-type proteins examined in this activity.______________________
4. Is it possible to exclude any of the suspects based on blood types? Explain your answer.
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5. Based on your results, does the crime-scene blood match the blood type of any of the four
suspects? Explain your answer.
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6. If blood from one of the suspects matches the crime-scene blood, does that prove that the
suspect is guilty? Explain your answer.
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7. Poor laboratory techniques may lead to erroneous results that could impact the outcome
of a trial. List 3 examples of poor laboratory techniques involved in a blood-typing
analysis that might produce erroneous results.
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8. Explain why identifying the blood type found in both the suspect and at a crime scene as
AB– provides a higher degree of probability of a match than if the blood type found in
the suspect and at the crime scene is O+.
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