The difference between organisms of the same species
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Selection pressure
An environmental factor that can alter the frequency of alleles in a population, when it is limiting
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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 ales from one generation to the next
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Gene pool
All the alleles present in a population at a given time
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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
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Genetic drift
Chance variations in allele frequencies in a population
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Evolution
A change in the average phenotype of a population
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Speciation
The formation of a new species
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Founder effect
The loss of genetic variation in an new population established by a vey small number of individuals from a larger population
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Species
A group of similar organisms that can interbreed to produce fertile offspring
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Reproductive isolation
The prevention of reproduction and, therefore, gene flow between breeding groups within a species
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Allopatric speciation
The evolution of new species from demes isolated in different geographic locations
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Sympatric speciation
The evolution of new species from demes sharing a geographical location
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Other cards in this set
Card 2
Front
An environmental factor that can alter the frequency of alleles in a population, when it is limiting
Back
Selection pressure
Card 3
Front
The increased chance of survival and reproduction of organisms with phenotypes suited to their environment, enhancing the transfer of favourable ales from one generation to the next
Back
Card 4
Front
All the alleles present in a population at a given time
Back
Card 5
Front
The frequency of an allele is its proportion, fraction or percentage of all the alleles of that gene in a gene pool
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