Theory of evolution - not mock

• what were Darwin's 4 observations?

  1.organisms produce more offspring than survive

  2.there's variation in the characteristics of members of the same species

  3.some of these characteristics can be passed on from one generation to the next

  4.individuals that are best adapted to their environment are more likely to survive
• darwin's theory of evolution by natural selection?

  individuals within a population show variation in their phenotypes

  selection pressures create a struggle for survival

  individuals with better adaptations are more likely to survive and reproduce and pass on their advantageous adaptations to their offspring

  overtime the proportion of the population with the advantageous adaptations increases

  over generations, this leads to evolution as the favourable adaptations become more common in the populations
• how wallace contributes to the theory of evolution?

  he independently came up with the idea of natural selection and wrote to darwin about it

  they both published papers on evolution together, acknowledging each others work - although they didn't always agree about the mechanisms involved in natural selection

  he provided more evidence which helped the theory be accepted
• Variation

  Change in environment

  Selection pressure

  Natural selection

  Reproduction

  Evolution
• implications of evolution for humans?

  crop infestations with pesticide-resistant insects are harder to control - some insects are resistant to lots of different pesticides. it takes farmers a while to figure out which pesticide will kill the insect, causing the crop to be destroyed

  if disease-carrying insects become pesticide-resistant, the spread of disease could increase

  a population of insects could evolve resistance to all pesticides in use, meaning new pesticides need to be produced, which takes time and costs money
• the same thing with pesticides occurs with drugs like antibiotics, leading to patients becoming ill or dying