1. Bacterial Reproduction

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

3. (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 x106 kg of cells
(enough to cover the earth)
9/22/2018

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

5. Asexual Reproduction
Binary Fission:
9/22/2018

6. Asexual Reproduction
Binary Fission:
9/22/2018

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

8. 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

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

10. Bacterial Conjugation
9/22/2018