The roles of genes and environment in evolution (part 2)
- Created by: une-meduse
- Created on: 22-05-13 21:02
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- THE ROLES OF GENES AND ENVIRONMENT IN EVOLUTION
- Is there free interbreeding in a population?
- Isolating mechanisms can split a population into subgroups
- Geographic barriers, eg rivers or mountains
- Seasonal barriers, eg climate change throughout the year
- Reproductive mechanisms, eg physical mating is no longer available, the species may incompatible
- This leaves two sub populations, alleles will be eliminated or increased
- Eventually the sub populations will not be able to interbreed and will become new species
- Isolating mechanisms can split a population into subgroups
- Genetic drift
- Fluctuations or changes in allele frequency is genetic drift
- In extreme cases genetic drift may lead to the elimination of an allele from the population
- Genetic drift may reduce genetic variation and may reduce the ability of a population to survive a new environment
- It could contribute to a new species being created
- It could also contribute to the extinction of a population or species
- Fluctuations or changes in allele frequency is genetic drift
- Is there free interbreeding in a population?
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