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DNA Analyst

Real-Life Activities

Real-Life Communication

You are facing a jury in a courtroom. You are a witness for the prosecution in a murder case. In your hand is a report, which states:

High molecular weight DNA was extracted from Exhibit 1. This DNA was typed by PCR using HLA-DQA1 and Polymarker systems with the following result:

HLA-DQA1: 1.2
Polymarker: LDLR Type B
GYPA: AB
HBGG: Type A
D7F8: AB
GC: Type B

When police found the victim, they also found blood that didn't match the victim. You tested the blood and you got the results above.

When the suspect was apprehended, you compared his DNA to the DNA left in Exhibit 1. His results were identical to the results noted in the report you are holding in your hand.

How do you tell this to the jury in a way they will understand? Only a few people on the jury have graduated from high school. One person has a commerce degree. Another person is a chartered accountant. The rest of the jury is either unemployed or working as salesclerks, messengers and office staff. Four of them did not complete Grade 10.

You know that your testimony can help put the murderer behind bars. You also know that if the jury doesn't understand what you are saying, the murderer might get away.