Allele Frequency (AQA A-Level Biology): Flashcards
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Allele frequency
Allele frequency
How often a particular allele occurs in a gene pool
Gene pool
Gene pool
All alleles of all genes in all individuals in a population
How does selection affect allele frequencies?
How does selection affect allele frequencies?
Changes them through environmental pressures that favour certain alleles over others
Selective advantage
Selective advantage
Alleles that help organisms survive and reproduce better
Result of selective advantage on allele frequency
Result of selective advantage on allele frequency
Increases favourable alleles, decreases less advantageous ones
Do environmental factors create new alleles?
Do environmental factors create new alleles?
No - they only influence frequency of existing alleles
Process that introduces new alleles
Process that introduces new alleles
Mutation
Evolution by natural selection (definition)
Evolution by natural selection (definition)
Change in allelic frequencies within a population over time
Level at which evolution occurs
Level at which evolution occurs
Population level, not within individual organisms
What gene pool represents
What gene pool represents
Total genetic variation available within a population