Evolution
- Created by: katiemint2
- Created on: 06-06-14 06:27
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- Evolution
- More then 3 billion years ago, life on earth began as simple organisms from which all the more complex organisms evolved (rather than just popping into existence)
- Animals move about the place and cant make their own food
- Plants make their own food by photosynthesis and are fixed to the ground
- Microorganisms are different to plants and animals eg bacteria are single celled
- Natural selection
- Mutation
- This is a change in the organisms DNA
- Most of the time mutations have no affect but sometimes they can be beneficial eg help with surviving or breeding
- If so, the beneficial mutation is more likely to be passed on to the future generation by natural selection
- Over time the beneficial mutation will accumulate in a population
- If so, the beneficial mutation is more likely to be passed on to the future generation by natural selection
- Most of the time mutations have no affect but sometimes they can be beneficial eg help with surviving or breeding
- This is a change in the organisms DNA
- Mutation
- Why people question evolution?
- Darwin couldn't give a good explanation about how new characteristics appeared as genes and mutations wernt discovered til 50 years later
- There wasn't enough evidence to convince many scientists
- It went against common religious beleifs about how the earth developed-first plausible explanation for exsistence without God.
- Lamarcks theory
- He argued that if a characteristic was used a lot by an organism then it would become more developed during its lifetime
- He believed this would then be passed on to the next generation
- This has now been rejected because if you dye an animals hair pink its offspring will still be born with the natural fur colour
- He argued that if a characteristic was used a lot by an organism then it would become more developed during its lifetime
- More then 3 billion years ago, life on earth began as simple organisms from which all the more complex organisms evolved (rather than just popping into existence)
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