bacterial reproduction. 2/22/20162 introduction bacteria can reproduce in one of two ways: 1....
DESCRIPTION
2/22/20163 Asexual Reproduction Binary Fission: one parent involved offspring are identical to parent & each other Advantages: 1. simple: only 1 parent 2. offspring are fully formed (no maturation needed) 3. very fast (20 min. in ideal conditions) after 24 hrs: 1 bacterium 2x10 6 kg of cells (enough to cover the earth)TRANSCRIPT
Bacterial Reproduction
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IntroductionBacteria can reproduce in one of two ways:
1. Asexually2.Sexually
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Asexual ReproductionBinary Fission: one parent involved offspring are identical to parent & each other
Advantages:1. simple: only 1 parent2. offspring are fully formed (no maturation needed)3. very fast (20 min. in ideal conditions) after 24 hrs:
1 bacterium 2x106 kg of cells (enough to cover the earth)
Asexual Reproduction
Disadvantages:• no genetic variety• one unfavourable environmental condition can wipe out
whole population
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Asexual ReproductionBinary Fission:
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Asexual Reproduction
Binary Fission:
Ecoli.mov
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Sexual Reproduction two parents involved offspring are genetically different
to parents & to each otherAdvantages:
genetic variety i.e. some are able to adapt to unfavourable conditions (ex: antibiotic resistance)
Disadvantages:1.more complex: slower because must find a
compatible partner
2.no new individuals produced (i.e. no increase in population)
Bacterial Conjugation
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• plasmid copies itself• passes through pili (cytoplasmic bridge) into recipient cell
•cells separate with both cells containing the plasmid
plasmid
donor recipient cell (+) cell ( - )
pili
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Homework Page 112 # 4, 5, 7
Bacterial Conjugation
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