Bacterial Reproduction

2/22/20162 Introduction Bacteria can reproduce in one of two ways: 1. Asexually 2. Sexually

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)

Asexual Reproduction Disadvantages: no genetic variety one unfavourable environmental condition can wipe out whole population 2/22/20164

5 Asexual Reproduction Binary Fission:

2/22/20166 Asexual Reproduction Binary Fission:

2/22/20167 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 2/22/20168 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

2/22/20169 Homework Page 112 # 4, 5, 7

Bacterial Conjugation 2/22/201610