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DNA

DNA. Mr. Skirbst Life Science Topic 07. DNA. Deoxyribonucleic acid. DNA. Deoxyribonucleic acid - stores & passes on genetic info from one generation to the next. Structure of DNA. Watson & Crick 1962 developed model of DNA. Structure of DNA. Watson & Crick 1962

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DNA

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  1. DNA Mr. Skirbst Life Science Topic 07

  2. DNA Deoxyribonucleic acid

  3. DNA Deoxyribonucleic acid - stores & passes on genetic info from one generation to the next

  4. Structure of DNA Watson & Crick 1962 developed model of DNA

  5. Structure of DNA Watson & Crick 1962 developed model of DNA - “twisted ladder” (double helix)

  6. Structure of DNA Watson & Crick 1962 developed model of DNA - “twisted ladder” (double helix) - “steps” made from 4 nitrogen bases

  7. Double Helix Structure

  8. Nitrogen Bases of DNA A – adenine

  9. Nitrogen Bases of DNA A – adenine T – thymine

  10. Nitrogen Bases of DNA A – adenine T – thymine G – guanine

  11. Nitrogen Bases of DNA A – adenine T – thymine G – guanine C – cytosine

  12. Nitrogen Bases of DNA A – adenine T – thymine G – guanine C – cytosine

  13. Nitrogen Bases of DNA

  14. Replication of DNA

  15. Replication of DNA Duplication of DNA 1. DNA “unzips”

  16. Replication of DNA Duplication of DNA • DNA “unzips” • “free” N bases pair up

  17. Replication of DNA Duplication of DNA • DNA “unzips” • “free” N bases pair up • 2 new DNA molecules form

  18. Chromosomes & DNA Chromosomes

  19. Chromosomes & DNA Chromosomes - rod-shaped structures in nucleus where genes are found

  20. Chromosomes & DNA Chromosome Theory

  21. Chromosomes & DNA Chromosome Theory - genes are carried from parent to offspring on chromosomes (ex. Humans have 23 pairs Fruit flies have 4 pairs)

  22. Chromosomes & DNA Meiosis - production of SEX CELLS with ½ normal # of chromosomes (through two divisions)

  23. Meiosis male

  24. Meiosis female 1 egg 3 Polar Bodies (disintegrate)

  25. Goober Chromosomes (4 pairs) 4 legs 2 eyes 1 tail fur

  26. Goober What would happen if all chromosomes from both parents were combined? What would happen if some of the chromosomes were missing?

  27. Meiosis Why is meiosis needed?

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