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  • Created by: mary
  • Created on: 22-01-13 17:36
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  • variation
    • variation is the difference between individuals of the same species.
    • when two different species breed, they produce infertile young known as a hybrid.
    • continuous variation doesnt fit in groups easily and values have a range e.g. height, weight
    • discontinuous variation fits into a small number of clearly defined groups e.g eye colour
    • speciation- process of evolution when new species form
    • variation is due to; genetic causes (inherritance) or environmental causes
    • evolution: 1)variation- population varies slightly. 2) over production-produce more young to survive to adulthood. 3) struggle for existance- competition between organisms. 4)survival-those with advantageous characteristics are more likely to survive. 5) better adapted organisms more likely to reproduce/pass on good genes. 6) gradual change-more in population will posses good characteristic and others will be lost,


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