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katherine ma

on 11 April 2013

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Transcript of DNA

DNA- Deoxyribonucleic Acid What is DNA? DNA stands for Deoxyribonucleic Acid
DNA is a spiral like staircase (double helix), that contains information in order for the body to operate correctly. DNA is a nucleic acid (Thymine, Adenine, Cytosine, Guanine) that carries information.
DNA are genetic codes that make up the Chromosomes that are in the nucleus of a cell.
Each little unit on a DNA is called a gene. What are Genes? Genes are located on the DNA which gives a specific function. How's DNA useful? PCR- Polymerase Chain Reaction Polymerase Chain Reaction is a technique for amplifying (enlarge, make more) DNA for tests.
DNA is very important when figuring out crime scenes.
When DNA is found PCR is used to make copies of the exact DNA to use for testing, and a back up if one messes up.
PCR is also used to amplify DNA because if there was a drop of blood found at a crime scene, there would not be enough cells in the drop of blood; therefore, PCR is used to make more of the DNA in the drop of blood. DNA- A Work Of Art RESTRICTION ENZYMES AND STICKY ENDS In order for DNA to replicate it needs to be cut into two, this is where the restriction enzyme comes into play.
Restriction enzymes cut the DNA into two different strands in order for the DNA to replicate.
Sticky ends are when the Restriction enzymes cuts the DNA into uneven pieces/ or uneven proportions. Gel Electrophoresis Gel Electrophoresis is the process in which molecules (such as proteins, DNA, or RNA fragments) separate. This moves the molecules from the negative side to the positive side.
The higher the density that the molecule is the slower it will get to the other side of the gel electrophoresis, the lower the density the faster the molecule will get to the other side. By: Katherine Ma Why is Gel Electrophoresis so important... Who's Your daddy? Well that would be fairly simple to answer if you knew who your father was. But what if you didn't? That is where DNA comes in and so does Gel Electrophoresis. Just inserting your mother's DNA and your potential fathers DNA then it could tell you who your father is. For example: Notice how these DNA's are similar?
This shows that the DNA matches with
one and another. Mother Child Father 1 Father 2 The mother's DNA is similar to the Child's DNA. Father 2's DNA does not match with
the Child's DNA.
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