Bacterial Reproduction

Introduction Bacteria can reproduce in one of two ways: Asexually 9/22/2018

(enough to cover the earth) Asexual Reproduction Binary Fission: one parent involved offspring are identical to parent & each other Advantages: simple: only 1 parent offspring are fully formed (no maturation needed) very fast (20 min. in ideal conditions) after 24 hrs: 1 bacterium 2x106 kg of cells (enough to cover the earth) 9/22/2018

Asexual Reproduction Disadvantages: no genetic variety one unfavourable environmental condition can wipe out whole population 9/22/2018

Asexual Reproduction Binary Fission: 9/22/2018

Asexual Reproduction Binary Fission: 9/22/2018

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: more complex: slower because must find a compatible partner no new individuals produced (i.e. no increase in population) 9/22/2018

Bacterial Conjugation donor recipient cell (+) cell ( - ) plasmid plasmid copies itself passes through pili (cytoplasmic bridge) into recipient cell cells separate with both cells containing the plasmid pili 9/22/2018

Homework Page 112 # 4, 5, 7 9/22/2018

Bacterial Conjugation 9/22/2018