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Variation (Population genetics (Hardy-Weinberg principle (States that in…
Variation
Population genetics
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Allele frequency
The frequency of an allele is its proportion, fraction or percentage of all the alleles of that gene in a gene pool
Genetic drift
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If a sexually reproducing population is in a stable environment and there is no mutation and no immigration or emigration, the frequencies of all alleles stays constant.
Hardy-Weinberg principle
States that in ideal conditions, allele and genotype frequencies in a population are constant from generation to generation.
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Selection Pressure
An environmental factor that can alter the frequency of alleles in a population, when it is limiting.
selective agents
Predation
When a population grows, predators have more food and their numbers increase.
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Natural selection
The increased chance of survival and reproduction of organisms with phenotypes suited to their environment enhancing the transfer of favourable alleles from one generation to the next