Evolution and speciation
- Created by: vezting
- Created on: 10-04-16 13:04
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- Evolution
- antibiotic resistance
- the evolutions of antibiotic resistance can be explained by natural selection
- to prevent the bacteria becoming resistant to all known antibiotics, more drugs need to be developed.
- devdeloping drugs takes time and money
- to check antibiotic resistance, disks soaked in different antibiotics are placed in bacteria
- where bacteria cant grow, the disk will stay clear, where it growns, the bacteria is resistant to that antibiotic
- there wil be a control disk with no antibiotic
- where bacteria cant grow, the disk will stay clear, where it growns, the bacteria is resistant to that antibiotic
- Darwins observations
- organisms produce more than survive
- theres variations in the characteristics of members of the same species
- some of the characteristics can be passed on from one generation to the next
- individuals that are best adapted to their environment are more likely to survive
- natural selection
- 1: random genetic mutation give variation in alleles
- 2: this allele may be favourable, and make thew organism better adapted to the environment
- 3: this select advantage give it better chance of survivng to an age of reproduction
- 4: the advantageous allele is passed on to the next generation
- 5: this happens over many generations until the alleles frequency has increased and this wil lead to evolution
- speciation
- evolution can lead to speciation. the new species and the old species can no longer reproduce and produce fertile offspring
- antibiotic resistance
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