Natural Selection (AQA A-Level Biology): Flashcards

Process by which organisms become better adapted to environment over time

All alleles of every gene in all individuals in a population

Environmental factors limiting population & determining survival/reproduction

Predation, disease, competition for resources, extreme conditions

Competition within the same species for limited resources

Creates intense competition for limited resources

Provides foundation for evolutionary change; enables adaptation

Higher survival & reproduction rates; pass traits to offspring

Over-production, genetic variation, selection pressures

Tolerance alleles increased in contaminated soils over time