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4.4 Bacteria Reproduction Presentation

Bacteria can reproduce through either asexual or sexual reproduction. Asexual reproduction, known as binary fission, involves a single parent splitting into two identical offspring very quickly, around 20 minutes under ideal conditions. This allows for rapid population growth but lacks genetic diversity. Sexual reproduction involves two bacterial parents exchanging genetic material, resulting in offspring that are genetically different from the parents and each other. This provides genetic variety and potential antibiotic resistance, but is more complex and does not increase population size.

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Bacterial Reproduction
04/28/19 2 Introduction Bacteria can reproduce in one of two ways: 1. Asexually 2.Sexually
04/28/19 3 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 2x106 kg of cells (enough to cover the earth)
Asexual Reproduction Disadvantages: • no genetic variety • one unfavourable environmental condition can wipe out whole population 04/28/19 4
04/28/19 5 Asexual Reproduction Binary Fission:
04/28/19 6 Asexual Reproduction Binary Fission: Ecoli.mov
04/28/19 7 Sexual Reproduction  two parents involved  offspring are genetically different to parents & to each other Advantages:  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 04/28/19 8 • 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
04/28/19 9 Homework  Page 112 # 4, 5, 7
Bacterial Conjugation 04/28/19 10