biology human variation
- Created by: gemma oneill
- Created on: 14-01-13 18:32
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- Variation
- population
- a group of the same species in the same place at the same time
- variation shown by humans may be the result of...
- genetics and enviroment
- continuous variation
- shows smooth differences between 2 extremes
- distontinuous variation
- catagories with no in-betweens
- DNA
- genetic code which dictates characteristics an organism will show
- eg. eye colour, skin colour, hair colour
- genetic code which dictates characteristics an organism will show
- enviroment variations
- sun~lightens hair and darkens skin
- hair dye~ changes hair colour
- smoking~discolours teeth
- variation reduces chances of species coming extinct
- adaptations~ survive better
- variation is not always useful...
- some variables are passed down and may cause disease or death(mutations)
- population
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