Biology (evolution theories& natural selection)
- Created by: morgxnleigh
- Created on: 22-11-15 14:28
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- Biology
- Darwin's& his theory of evolution
- life on Earth has changed over geological time
- Scientists believe this is the reason why all living things on Earth exist today
- The theory is supported by evidence from fossils, and by the rapid changes that can be seen to occur in microorganisms such as antibiotic-resistant bacteria
- Many species have become extinct in the past and the extinction of species continues to happen
- His theory went against religious views, that God had made all the animals and plants.
- Darwin did not have enough evidence at the time to convince many scientists
- it took 50 years after Darwin’s theory was published to discover how inheritance and variation worked.
- Darwin did not have enough evidence at the time to convince many scientists
- Darwin's theory caused controversy among his contemporaries and his ideas were only gradually accepted
- Although some people still don't accept it today.
- Lamarck& his theory of evolution
- Jean-Baptiste Lamarck was a French scientist who developed an alternative theory of evolution at the beginning of the 19th century
- His theory involved two ideas
- A characteristic which is used more and more by an organism becomesbigger and stronger, and one that is not used eventually disappears
- Any feature of an organism that is improved through use is passed to its offspring
- Natural selection
- The theory of evolution states that evolution happens by natural selection. The key points are that......
- individuals in a species show a wide range of variation
- this variation is because of differences in their genes
- individuals with characteristics most suited to the environment are more likely to survive and reproduce
- the genes that allow these individuals to be successful are passed to their offspring
- The theory of evolution states that evolution happens by natural selection. The key points are that......
- Darwin's& his theory of evolution
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