Blood Typing

1. The Major Types of Blood

• A, B, AB, and O.
• Individuals with type A blood can receive blood from donors of type A and type O blood.
• Individuals with type B blood can receive blood from donors of type B and type O blood.
• Individuals with type AB blood can receive blood from donors of type A, type B, type AB, or type O blood.
• Individuals with type O blood can receive blood from donors of only type O.
• Individuals of type A, B, AB and O blood can receive blood from donors of type O blood.
• Type O- blood is called the universal donor.

2. What is Meant by Positive or Negative Blood Types?

The terms "positive" or "negative" refer to either the presence or absence of the RhD antigen irrespective of the presence or absence of the other antigens of the Rhesus system.

http://en.wikipedia.org/wiki/Blood_type

3. Comments and Analysis on Lab Findings.

In our crime scene we had a sample of blood. We placed two drops on each side of a slide.

We then mixed anti-A and anti-B with each of them. Since no precipitate formed in either of

them, we were left to believe that the killer had an "O" bloodtype.