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14 Cards in this Set
- Front
- Back
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Define species |
A group of similar organisms that can reproduce to give fertile offspring |
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Define population |
A group of organisms of the same species living in a particular area at a particular time - so that they have potential to interbreed |
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Define gene pool |
Complete range of alleles present in the population |
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Define allele frequency |
It is how often an allele occurs in a population |
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What does the hardy-weinberg principle predict? |
That the frequencies of alleles in a population won't change. |
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What conditions must be present for the hardy-weinberg principle to be valid? |
Large population Random mating No immigration, emigration, mutations or natural selection |
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What are the two hardy-weinberg equations? |
p + q = 1 p^2 + 2pq + q^2 = 1 |
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What causes variation? |
Genes, the environment or both. |
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Natural selection |
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Name the three different types of natural selection |
Stabilising Directional Disruptive |
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What is speciation |
It is the development of a new species from an existing one |
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What is allopatric speciation? |
It is the division of a population of a species by a physical barrier, which is know as geographical isolation |
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What is sympatric speciation? |
When a population becomes reproductively isolated |
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How can reproductive isolation occur? |
Seasonal Mechanical Behavioural |
