plate 15 - bacterial reproduction
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Plate 15 - Bacterial Reproduction
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Sexual vs. Asexual Reproduction
Asexual – no change in genetic makeup of daughter cells, all are identicalSexual – daughter cells are genetically different than parents
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Gametes
Gametes – sex cells (sperm & egg), the result of meiosis
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Binary Fission
Binary = 2Fission = split apartAsexual reproduction Occurs after a period of growth
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Binary Fission Steps1. DNA replication (time
frame is minutes or hours)2. Protein synthesis (~ 40
minutes)3. Replication of structures
(7 minutes)4. Cytoplamic separation &
pinching (7 minutes)5. New cell walls form (7
minutes)
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DNA
DNA is copied by cell enzymes (transcription)Makes 2 copies (looped DNA)
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Cytoplasm
Increase in metabolism causes rapid manufacture of cytoplasm & structuresCauses increase in mass of cell & length
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Effects of Antibiotics
Penicillin acts to weaken cell wallCell wall is so weak that cell bursts and dies (like using paper instead of concrete blocks for walls) Only works on growing cellsMature cells are NOT affected
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Daughter Cells
“Daughter” is a misnomer, but still used (not female)
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Generation TimeGenetically 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