Evolution

lauren_morris
Mind Map by lauren_morris, updated more than 1 year ago
lauren_morris
Created by lauren_morris over 8 years ago
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Description

Biology Mind Map on Evolution, created by lauren_morris on 04/19/2013.

Resource summary

Evolution
  1. Theories
    1. Darwin's
      1. Based on Natural Selection
        1. Individuals compete for resources
          1. Those with characteristics best suited survive
            1. These individuals reproduce to produce more well-suited individuals
            2. Random mutations cause variation in the species
              1. This idea was found after Darwin's time
                1. It was the evidence he needed
            3. People objected at first
              1. Theory goes against story of creation
                1. Not enough evidence
                  1. No evidence of inheritance or variation
                2. Lamarck's
                  1. If characteristic used a lot, that would improve over generations
                    1. If characteristic not used a lot, eventually disappear
                      1. Usually dismissed today
                        1. Species would become more complex
                          1. There are still simple organisms around today
                      2. Darwin's is most trusted today
                      3. Example
                        1. The Peppered Moth
                          1. Random mutation caused variation - some dark, some light
                            1. Tree surfaces are dark due to pollution
                              1. Dark moth less likely to be seen and eaten
                                1. Dark moths survive and breed
                                  1. Dark characteristics repeated over generations
                        2. Classification
                          1. Organisation of living things according to their similarities
                            1. E.g. Animal and Plant Kingdoms
                              1. Smallest - species
                            2. Rapid Mutation of TB
                              1. 1. TB infects someone. The variation in the TB due to random gene mutations means that some bacteria are resistant to antibiotics
                                1. 2. After a course of antibiotics, all bacteria are killed except the resistant ones. This is through survival of the fittest and is Natural Selection
                                  1. 3. These reproduce, passing on the resistant gene, keeping the patient ill
                                    1. 4. So, a new drug has to be found that they are not resistant to.
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