Bacterial Reproduction Introduction Bacteria can reproduce in one

Bacterial Reproduction

Introduction Bacteria can reproduce in one of two ways: 1. Asexually 2. 11/29/2020 Sexually 2

Asexual Reproduction Binary Fission: l l 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) l after 24 hrs: 1 bacterium 2 x 106 kg of cells (enough to cover the earth) 11/29/2020 3

Asexual Reproduction Disadvantages: • no genetic variety • one unfavourable environmental condition can wipe out whole population 11/29/2020 4

Asexual Reproduction Binary Fission: 11/29/2020 5

Asexual Reproduction Binary Fission: 11/29/2020 6

Sexual Reproduction two parents involved l offspring are genetically different to parents & to each other Advantages: l genetic variety i. e. some are able to adapt to unfavourable conditions (ex: antibiotic resistance) l Disadvantages: 1. more complex: slower because must find a compatible partner 2. no new individuals produced (i. e. no increase in population) 11/29/2020 7

Bacterial Conjugation donor recipient cell (+) cell ( - ) plasmid • plasmid copies itself • passes through pili (cytoplasmic bridge) into recipient cell 11/29/2020 • cells separate with both cells containing the pili 8

Homework l 11/29/2020 Page 112 # 4, 5, 7 9

Bacterial Conjugation 11/29/2020 10