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The Structure of DNA

The Structure of DNA. DNA: The Genetic Material. Mendel (1800 ’ s) showed that traits are passed from parents to offspring. DNA: The Genetic Material. The instructions for inherited traits are called genes 1950 ’ s – scientists determined that genes were made of DNA

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The Structure of DNA

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  1. The Structure of DNA

  2. DNA: The Genetic Material • Mendel (1800’s) showed that traits are passed from parents to offspring

  3. DNA: The Genetic Material • The instructions for inherited traits are called genes • 1950’s – scientists determined that genes were made of DNA • DNA: primary material that causes recognizable, inheritable characteristics in related groups of organisms

  4. Discovering DNA’s Structure • Rosalind Franklin used x-ray diffraction to determine the structure of DNA • Images suggested DNA resembled a tightly coiled helix composed of two chains of nucleotides

  5. Discovering DNA’s Structure • Watson and Crick constructed a 3D model of DNA • Used information from experiments conducted by other scientists • Determined the structure of DNA was a double helix made of two strands of nucleotides • Won Nobel Prize in 1962

  6. The Shape of DNA • A DNA molecule looks like a spiral staircase and is composed of two parallel strands of linked subunits called nucleotides

  7. The Shape of DNA • A nucleotide has 3 parts: phosphate group, sugar (deoxyribose), and a base • The phosphate and sugar link together to form the back bone • The bases pair together to connect the two strands

  8. DNA Assignments • DNA – The Double Helix practice sheet • Build a 3D DNA Model • Build a DNA Molecule Online Activity: http://learn.genetics.utah.edu/content/begin/dna/builddna/ (see my webpage for link)

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