topic 4

    Cards (7)

    • natural selection means survival of the fittest
    • individuals in a population show genetic variation because of differences in their alleles and new alleles arise through mutations
    • things like predation, competition and diseases can act as selection pressures meaning it can affect an organisms chance of surviving and reproducing
    • organisms with characteristics that make them better adapted to the selection pressures have a better chance of survival
    • what is Darwin's theory of evolution?
      natural selection
    • what are the key ideas of natural selection?
      organisms show genetic variation due to random mutation - best adapted to survival and reproduce - best adapted pass on beneficial alleles to offspring
    • what is meant by antibiotic resistant bacteria?
      bacteria that are not killed by antibiotics