Changing Evidence
Differing evidence for evolution with advantages and disadvantages.
- Created by: Agnes Fitzpatrick
- Created on: 19-11-13 17:40
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- Theory of evolution by natural selection
- evidence
- fossils
- type
- peat bogs/low oxygen environments
- bone/tissue preserved
- chemicals in bone are replaced by chemicals in rock
- open to interpretation
- differs from one scientist to the next
- organisms occupying similar niches may appear closely related due to selection pressures
- Advantages of DNA evidence over fossil evidence
- only need small sample to get clear picture
- Won't change for individuals over time
- Disadvantages of DNA evidence over fossil evidence
- Can only really be used on species whereorganic material is still available
- fossils
- DNA
- protein homologies
- short sections of DNA
- look at specific sequences
- example: beta haemoglobin
- look for differences
- DNA profiling
- Comparison of base sequences
- DNA hybridisation
- large quantities of DNA
- whole genome
- mixing DNA of different species
- NOT ON THE SYLLABUS
- large quantities of DNA
- protein homologies
- speciation
- evidence
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