Do Now 1/6/2014 Probity: virtue, integrity Task: Copy the drawing below. Identify the organism. Label the areas identified by arrows. Hint: small “hairs” Hint: outer cover Hint: used for moving Hint: inner lining 3/24/2016 Most difficult: loop of DNA 1 Bacterial Reproduction Introduction Bacteria can reproduce in one of two ways: 1. Asexually 2. 3/24/2016 Sexually 3 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 2x106 kg of cells (enough to cover the earth) 3/24/2016 4 Asexual Reproduction Disadvantages: • no genetic variety • one unfavourable environmental condition can wipe out whole population 3/24/2016 5 Asexual Reproduction Binary Fission: 3/24/2016 6 Asexual Reproduction Binary Fission: 3/24/2016 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: 1. more complex: slower because must find a compatible partner 2. no new individuals produced (i.e. no increase in population) 3/24/2016 8 Bacterial Conjugation donor recipient cell (+) cell ( - ) plasmid • plasmid copies itself • passes through pili (cytoplasmic bridge) into recipient cell pili • cells separate with both cells containing the plasmid 3/24/2016 9 Homework 3/24/2016 In text book: read pages 148-149 Quiz Wednesday Test Friday 10