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Plate 15 - Bacterial Reproduction

Plate 15 - Bacterial Reproduction. Sexual vs. Asexual Reproduction . Asexual – no change in genetic makeup of daughter cells, all are identical Sexual – daughter cells are genetically different than parents. Gametes. Gametes – sex cells (sperm & egg), the result of meiosis. Binary Fission.

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Plate 15 - Bacterial Reproduction

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  1. Plate 15 - Bacterial Reproduction

  2. Sexual vs. Asexual Reproduction • Asexual – no change in genetic makeup of daughter cells, all are identical • Sexual – daughter cells are genetically different than parents

  3. Gametes • Gametes – sex cells (sperm & egg), the result of meiosis

  4. Binary Fission • Binary = 2 • Fission = split apart • Asexual reproduction • Occurs after a period of growth

  5. Binary Fission Steps • DNA replication (time frame is minutes or hours) • Protein synthesis (~ 40 minutes) • Replication of structures (7 minutes) • Cytoplamic separation & pinching (7 minutes) • New cell walls form (7 minutes)

  6. DNA • DNA is copied by cell enzymes (transcription) • Makes 2 copies (looped DNA)

  7. Cytoplasm • Increase in metabolism causes rapid manufacture of cytoplasm & structures • Causes increase in mass of cell & length

  8. Effects of Antibiotics • Penicillin acts to weaken cell wall • Cell wall is so weak that cell bursts and dies (like using paper instead of concrete blocks for walls) • Only works on growing cells • Mature cells are NOT affected

  9. Daughter Cells • “Daughter” is a misnomer, but still used (not female)

  10. Generation Time • Genetically determined, different species different times to undergo binary fission • Ex: E. coli = 20 minutes • Environment also determines the generation time (cold temperatures slow it down) • Measured from the start of one binary fission event to the start of the next

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