Natural Selection 0.0 / 5 ? BiologyEvolutionIGCSEAQA Created by: Nicole DCreated on: 22-02-14 18:40 Natural Selection 7 Stages 1 of 12 Variation Individuals vary slightly because of differences in genes (caused by mutations) 2 of 12 Advantageous characteristics Variations may better adapt some organisms to their environment than others 3 of 12 Over - production Most organisms produce more young that will survive to adulthood 4 of 12 Struggle for Existance Environment can only support a certain number so there is competition for survival between organisms 5 of 12 Survival of the fittest Only the organisms which are really well adapted (i.e. advantageous characteristics) will survive 6 of 12 Advantageous genes passed onto offspring Well adapted organisms will reproduce, therefore passing on their advantageous genes to their offspring 7 of 12 Gradual change Population will lose poorly adapted individuals over time. Advantageous gene continues being passed on through generations. 8 of 12 What are mutations? Changes to the genes 9 of 12 How do mutations occur? Inherited from a parent or acquired during an organism's lifetime 10 of 12 Why are mutations important to evolution? It produces a new form of a gene giving the organism an adaptation making it better suited to its environment 11 of 12 Why is that useful? Makes it more likely to survive, reproduce and pass on advantageous gene 12 of 12
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