Variation and evolution key words

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Variation
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

Preview of the back of card 3

Card 4

Front

All the alleles present in a population at a given time

Back

Preview of the back of card 4

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

Back

Preview of the back of card 5
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