Date post: | 18-Jan-2018 |
Category: |
Documents |
Upload: | colleen-flynn |
View: | 215 times |
Download: | 0 times |
Bacterial Reproduction
05/05/23 2
IntroductionBacteria can reproduce in one of two ways:
1. Asexually2.Sexually
05/05/23 3
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
05/05/23 4
05/05/23 5
Asexual ReproductionBinary Fission:
05/05/23 6
Asexual Reproduction
Binary Fission:
Ecoli.mov
05/05/23 7
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
05/05/23 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
05/05/23 9
Homework Page 112 # 4, 5, 7
Bacterial Conjugation
05/05/23 10