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•  Evolution occurs when heritable characteristics of a species change

Evolution at its most fundamental level simply describes a change over time

  • In living organisms this change refers to the heritable characteristics of a species (biological evolution)

Heritable characteristics are encoded for by genes and may be transferred between generations as alleles 

  • Hence biological evolution describes cumulative changes that occur within a population between one generation and the next

A concise definition for biological evolution is:

  • A change in the allele frequency of a population’s gene pool over successive generations

Evolution = Change Over Time

change over time