Home / blood typing lab answers / A Rh A Rh - Science Spot

A Rh A Rh - Science Spot - blood typing lab answers


A Rh A Rh - Science Spot-blood typing lab answers

Name _______________________________
Blood Typing Lab Activity Complete the chart using the class notes.
A small pool of blood and a weapon was found near a garbage dumpster. Clumping = + (Positive)
After examining the area, the CSI on the scene discovered a body in the No Clumping = - (Negative)
garbage dumpster and identified him as Earnest "One-Eyed" Earl. Earl had Reactions w/ Reactions w/
a wound to his chest that will be analyzed by the medical examiner. Type Anti-A Serum Anti-B Serum
The CSI tested blood samples from the blood pool and the weapon at the A
crime scene. It was determined that it was human blood, but he needs to B
know the blood type to help identify if it was from the victim or the person AB
who murdered him. He has identified three suspects that either knew the
victim or were seen in the area before the body was discovered. He would O
like to question them further while he waits for DNA test results. Rh Serum = Clumping = Rh+ blood
Lab Results - Follow your teacher's directions to complete the lab. Remember to be careful to prevent cross-
contamination of the blood samples! Record the results (+ or -) from each group in the trays below.
Suspect #1: Suspect #2 Suspect #3
Bobby "Baby" Brooks "Slim" Jim Snoot Barbie "Doll" Jones
A A A
Rh Rh Rh
Type Type Type
B B B
A A A
Rh Rh Rh
Type Type Type
B B B
Victim Crime Scene Sample Weapon Sample
Ernest "One-Eyed"
What do your results show?
What should investigators do next?
T. Trimpe 2006 http://sciencespot.net/
Teacher Notes:
I used the simulated blood kits from Ward's for this lab. The simulated blood typing kits come with 4 vials of
"blood" and three bottles of serum as well as typing trays and toothpicks.
Link: http://www.wardsci.com/product.asp_Q_pn_E_IG0007567_A_Simulated+ABO+and+Rh+Blood-Typing+Lab+Activity
Preparation:
In order to save on supplies, I developed six sets of materials each with only one vial of blood and the three
bottles of serum. Each "set" is stored in a small plastic container along with a blood typing tray and toothpicks.
If you will have more than 6 groups of students, you may need to create two more sets of kits and adjust the
scenarios listed below.
I printed labels for six bottles of sample blood to correspond with each of the suspects and the victim as well as
the samples from the crime scene and weapon. Use the scenarios below to set up your kits or come up with
your own combinations.
Blood Vial Labels Scenario 1: Blood Vial Labels Scenario 2:
Suspect #1 = Sample A Suspect #1 = Sample A
Suspect #2 = Sample B Suspect #2 = Sample B
Suspect #3 = Sample C Suspect #3 = Sample C
Victim = Sample D Victim = Sample D
Crime Scene = Sample A Crime Scene = Sample D
Weapon = Sample D Weapon = Sample A
Conclusion:
For Scenario #1, the students should conclude that the crime scene sample matched suspect #1 (Baby Brooks)
and the weapon sample matched the victim (Earl). Answers will vary as to what should be done next in the
investigation. Lead the class in a discussion to identify possible scenarios that would lead to the results shown
in their blood typing tests. For example, why would Baby Brooks' blood type match the blood in the puddle at
the crime scene instead of both samples matching the victim?
For Scenario #2, the students should conclude that the crime scene sample matched the victim (Earl) and the
weapon and the weapon sample matched suspect A (Baby Brooks). Answers will vary as to what should be
done next in the investigation. Lead the class in a discussion to identify possible scenarios that would lead to the
results shown in their blood typing tests. For example, why would Baby Brooks' blood type match the blood on
the weapon instead of the victim's type?
Need a cheaper version? Visit the Forensic Science page of my website at http://sciencespot.net/ for a version
using milk, vinegar, and water to simulate blood typing.
T. Trimpe 2006 http://sciencespot.net/

Why do doctors need to know about blood typing?There are several major reasons you may want to get blood tests more often than that:You’re experiencing unusual, persistent symptoms. These could include anything from fatigue to abnormal weight gain to new pain.You want to optimize your health. ...You want to reduce your risk of disease or complications. ...