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BIOL 200 (63)
Mary Silas (53)


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BIOL 200
Mary Silas

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Variation  Variation is the presence of any differences (genotypic and phenotypic), between individuals in a population, or between parents and offspring.  Genotypic variation can be due to: o Mutation o Random assortment during Meiosis, o Crossing over during Meiosis, o Random fertilisation of gametes.  Phenotypic variation can be due to: o Genetic Factors, o Environmental Factors, o Combination of both.  Variation provides organisms with a means of producing new phenotypes.  Variations to the structure or behaviour of an organism may confer a selective advantage to survive and reproduce Evolution  Evolution is the sum of changes of heritable characteristics in population.  It is the development of life in geological time  Natural selection is the process where organisms that are better adapted to their environment survive and breed.  Those that fail to adapt w
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