DNA%20Structure

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DNA Structure
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DNA stands for... Deoxyribonucleic Acid
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Chromosomes and DNA

• DNA, genes, and chromosomes compose the
  molecular basis for heredity.
• A chromosome is a structure in the nucleus of a
  cell consisting of one long thread of DNA that is
  tightly coiled

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Genes and DNA

• A gene is a specific location on a chromosome,
  consisting of a segment of DNA
• Each chromosome consists of hundreds of genes
  determining the many proteins for an organism.

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Discovering the structure of DNA

• Discovered in 1953 by James Watson Francis
  Crick
• - double helix twisted ladder spiral staircase

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DNA Structure cont.

• Rosalind Franklin -
• XRay Defraction Image of DNA proved that it was
  a double helix/twisted ladder shape

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Discovery of DNA Timeline
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DNAcodes for your genes (traits)made of
repeating subunits called nucleotides
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What is a nucleotide?

• Three components
• 1. PHOSPHATE
• 2. DEOXYRIBOSE (sugar)
• 3. BASE (A,T,G,C)

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Base-Pair Rule

• Adenine ltgt Thymine
• Guanine ltgt Cytosine
• The sides/backbone of the DNA
• ladder are phosphate
• sugar held together
• by hydrogen bonds.

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Base Pair Rule

• One side A T A T C A T G C
  G G G
• Other side