Question

You are a crime scene investigator analyzing a crime scene. Your victim has type A blood and your suspect has Type B blood. You analyze a blood sample found at the crime scene and identify anti-A antibodies and B antigens. Whose blood is it

Answer 1

Answer: the blood belongs to my suspect who has type B blood.

Step-by-step explanation:

In 1900, Karl Landsteiner convincingly demonstrated that there were individual differences between the plasma membrane of the red cells of normal individuals. These differences has been a useful tool in the field of forensic science.

Landsteiner showed the presence of one of two antigens ( either A or B or neither, which was later called O) on the red cells of each individual. He also discovered that the serum from such individuals contained different antibodies. Example:

Blood group A contained antibody B

Blood group B contained antibody A

Blood group O contained antibody A and antibody B.

Blood group AB contained no antibody.

From the above discovery by Landsteiner, the blood analysed from the crime scene belongs to my suspect who has type B blood.