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what is the theory of evolution?
- - These are changes over generations in the proportions of individual organisms that differ genetically.
- - set of processes
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what are the 2 types of evolutionary processes
- Microevolution - this is within species and minor changes.
- - Macroevolution - this is among species of different variations like significant changes.
- - similarities between the 2 are :
- - processes that create new types of individuals
- - processes that change the frequencies of different types of individuals. ( mutation is positive, the frequency goes up, if mutation is negative, frequency goes down
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what is a theory
- this is a system of ideas or statements held as an explanation or account of a group of facts or phenomena
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Lamarck's theory
- - first theory that recognized the possibilty of evolution even through he believed in spontaneous generation
- - believed that organisms have an imaginary force inside of them, to change themselves for the better ( they produce new parts to satisfy their needs )
- - reasoned that use and diuse of certain structures could be passed on
- - failed to come up with mechanism for how evolution came to be.
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- - his theory in invalid but still showed that evolution is adaptive and the result of adaptations.
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why was Lamark wrong?
- - This is because he believed that acquired traits were inherited but they are not.
- - Only DNA is inherited
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what theory did George Louis Leclerc propse ?
- - in the 18th century, he said that species could change over time.
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Theory of carl Linnaeus
- He proposed that species became hybrids that then formed new species
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Theory of Erasmus Darwin
- suggested that all life came from a single source.
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