Natural selection + evolution
- Created by: Dave1010
- Created on: 17-12-17 19:04
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- Genetics
- Variation: the differences in phenotypes within a population
- Genetic variation is variation caused directly by your genetics (e.g. eye colour)
- Environmental variation is variation caused by differences in the environments a species lives in.
- An example is the colour of a plant's leaves: plants in direct sunlight have greener leaves than those grown in darker places
- Theory of evolution:
- All of today's species have evolved from simple life forms that first started to develop over 3 billion years ago
- Natural selection
- Individuals within a species show variation due to mutations and mixture of genetics
- Some genetic variation gives rise to a phenotype that help the individual survive better than others in the species (e.g. longer legs so it can escape from predators)
- The organisms with these advantageous genetics are more likely to survive and reproduce than those without the advantage
- These advantageous characteristics are passed onto the next generation
- Over time, the number of organisms with the advantageous characteristics will decrease, whilst the number with the characteristics will increase
- This leads to a change in the genetics of the species.
- Over time, the number of organisms with the advantageous characteristics will decrease, whilst the number with the characteristics will increase
- These advantageous characteristics are passed onto the next generation
- The organisms with these advantageous genetics are more likely to survive and reproduce than those without the advantage
- Some genetic variation gives rise to a phenotype that help the individual survive better than others in the species (e.g. longer legs so it can escape from predators)
- Individuals within a species show variation due to mutations and mixture of genetics
- Natural selection
- Individuals within a species show variation due to mutations and mixture of genetics
- Some genetic variation gives rise to a phenotype that help the individual survive better than others in the species (e.g. longer legs so it can escape from predators)
- The organisms with these advantageous genetics are more likely to survive and reproduce than those without the advantage
- These advantageous characteristics are passed onto the next generation
- Over time, the number of organisms with the advantageous characteristics will decrease, whilst the number with the characteristics will increase
- This leads to a change in the genetics of the species.
- Over time, the number of organisms with the advantageous characteristics will decrease, whilst the number with the characteristics will increase
- These advantageous characteristics are passed onto the next generation
- The organisms with these advantageous genetics are more likely to survive and reproduce than those without the advantage
- Some genetic variation gives rise to a phenotype that help the individual survive better than others in the species (e.g. longer legs so it can escape from predators)
- Individuals within a species show variation due to mutations and mixture of genetics
- Variation: the differences in phenotypes within a population
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