Essay on Gel Lab

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1. DNA samples can be obtained from many places in a crime scene. They include; in blood samples, hair, skin, saliva and semen that is found near the crime scene.

2. The purpose of washing the pipette between uses is to avoid cross contamination between the DNA. If one sample of DNA is mixed with another, results will become invalid. The DNA bands will not show properly because both sample of DNA will be mixed.

3. You can tell how committed the crime by matching the banding patterns from the suspect to the caused by the DNA will show the size of the DNA based on the number of base pairs before the restriction enzyme cuts the DNA. If a suspect has the same size of DNA as the DNA sample found at the crime scene, than he or she has committed the crime.

4. Suspect 2 has committed the crime because the banding patterns of their DNA and the DNA found at the crime scene match in size.

5. The gel electrophoresis pattern shows the size of DNA strand by cutting the DNA using a restriction enzyme at a different point. It determines that each person has unique base pair patterns in their DNA. If this were not the case, then the restriction enzyme would have cut the DNA at the same in every DNA sample. The banding patterns of all samples of DNA would have been the same. However, the

6. Two people can have identical DNA patterns if only one restriction enzyme was used and the restriction enzyme cut both of the DNA samples at the exact same spot. This is however very unlikely because DNA base-pair patterns are often very unique in each individual. In addition, more than one restriction enzyme is used when conducting a gel electrophoresis lab to obtain a more accurate result.

7. Since DNA is transparent, it cannot be detected after a gel electrophoresis. Ethidium bromide is used to stain the DNA. This makes the

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