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DNA!<br />CLASS NOTES<br />Fri. Oct. 1, 2010<br />
What is DNA?<br />Chromosomes in the nucleus of a cell have a code<br />This code is a chemical called DNA (stands for: de...
What does it look like?<br />DNA is in the shape of a double helix <br />Like a twisted ladder<br />The ‘steps’ of the lad...
Base pairs<br />These bases are important for the replication of chromosomes before mitosis<br />The DNA double helix ‘unw...
Practice DNA sequencing<br />For example, if you had a piece of DNA that is 10 bases long:  A G C T T A G G C<br />What is...
MUTATIONS<br />A mutation is ANY permanent changein the genetic information of a cell<br />For example:<br />Extra chromos...
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Dna!

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Dna!

  1. 1. DNA!<br />CLASS NOTES<br />Fri. Oct. 1, 2010<br />
  2. 2. What is DNA?<br />Chromosomes in the nucleus of a cell have a code<br />This code is a chemical called DNA (stands for: deoxyribonucleic acid)<br />DNA is passed on and copied to new cells. It controls all activities in the cell <br />
  3. 3. What does it look like?<br />DNA is in the shape of a double helix <br />Like a twisted ladder<br />The ‘steps’ of the ladder are made up of molecules called NITROGENOUS BASES<br />There are 4 types of bases:<br />Adenine, guanine, cytosine and thymine<br />A, G, C and T<br />A always pairs with T <br />G always pairs with C<br />
  4. 4. Base pairs<br />These bases are important for the replication of chromosomes before mitosis<br />The DNA double helix ‘unwinds’ and each side makes a new copy<br />
  5. 5. Practice DNA sequencing<br />For example, if you had a piece of DNA that is 10 bases long: A G C T T A G G C<br />What is the sequence of the new DNA strand?<br /> REMEMBER: <br />A always pairs with T <br />G always pairs with C<br />Answer:<br />
  6. 6. MUTATIONS<br />A mutation is ANY permanent changein the genetic information of a cell<br />For example:<br />Extra chromosome/missing a piece of a chromosome<br />Incorrect matching of base pairs <br />A + C instead of A + T<br />An extra/missing base pair <br />Mutations occur frequently but not all of them have harmful effects!<br />Sickle cell anemia<br />

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