DNA stands for Deoxyribonucleic Acid. It is a molecule not just found in the cells of people but, animals and plants.

DNA holds the genetic code that makes us all very unique. Our height, sex, hair, eye colour and other personal features contribute to the variations in the code. 50% of our DNA was inherited from each parent. Siblings are more likely to have similar DNA than unrelated people.

Imagine a tangled knot of very thin strands; that is how DNA exists in the cells of our body but it is invisible. If we straightened it out, the DNA from each cell would stretch to two metres long. It is difficult to imagine that we have more than six feet of it inside a cell and it is actually invisible to the human eye!

If we took the DNA from all the cells in our body it would stretch to the sun and back not once or twice but a whopping 500 times. We have more than 45,000,000,000 miles of DNA!

DNA Crime Prevention and Detection.

Given that it is highly likely for a sample of DNA to be found at the scene of crime, it can be used in a number of ways. It can be compared with a sample that has been taken from a suspect. A positive match can be used as evidence. Read the rest of this entry »

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