Deoxyribonucleic Acid (DNA)

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Deoxyribonucleic Acid (DNA)
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• Identification of specimens using DNA has had
  other benefits, in one third of the cases where
  this technique has been used, DNA analysis has
  been able to exonerate people wrongly accused of
  crimes.
• Prisoners wrongly accused of rape or murder have
  been freed on basis of DNA evidence.
• DNA analysis is now a common tool for
  establishing paternity, and it has been called on
  to identify remains after tragedies such as
  airline accidents and the inferno at the Branch
  Davidian complex in Waco, Texas.

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Features of DNA that are Important for
Analysis

• DNA is composed of four different chemical
  building blocks called "bases". These four bases
  are
• Adenine
• Guanine
• Thymine
• Cytosine

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DNA Structure
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DNA within the chromosomes
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Techniques used for DNA
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Where is DNA Found?
In organisms called eukaryotes, DNA is found
inside a special area of the cell called the
nucleus. Because the cell is very small, and
because organisms have many DNA molecules per
cell, each DNA molecule must be tightly packaged.
This packaged form of the DNA is called a
chromosome.
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What is DNA made of?
DNA is made of chemical building blocks called
nucleotides.
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DNA Sequences used to make
Proteins
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