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Introduction to DNA

Introduction to DNA. Question :. From your on-line computer activity, what do you know about the structure of DNA ?. Structure of DNA. DNA is a polymer of what????. Nuclotides!. There are two types of bases:. Adenine & Guanine ( A & G ) = Thymine & Cytosine ( T & C) =.

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Introduction to DNA

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  1. Introduction to DNA

  2. Question: • From your on-line computer activity, what do you know about the structure of DNA?

  3. Structure of DNA • DNA is a polymer of what????

  4. Nuclotides!

  5. There are two types of bases: Adenine & Guanine ( A & G ) = Thymine & Cytosine ( T & C) =

  6. There are two types of bases:

  7. Intro to DNA • Chromosomes exist in “matching pairs” in the nucleus of a cell • Scientists call the matching pairs “homologous pairs”. • In every human body cell, there are 23 homologous pairs of chromosomes.

  8. Example of a human Karyotype IN HUMANS Pair # 1- 22 = “autosomes” Pair #23 = “Sex chromosomes”* XX = * XY =

  9. Karyotype • What does the prefix “homo” mean? • How are homologs similar? #1 #2 #3 #4

  10. Karyotype Q: How are homologs different???? • GENE – A:

  11. IMPORTANT !! • All 46 chromosomes are present in every human body cell!!! Therefore • All 30,000 genes pairs which make up a human are in every human body cell!

  12. IMPORTANT !! • Genome – • *** Every body cell of an organism contains its entire genome !!!! *****

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