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