BY5.5 Variation

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  • sexual reproduction produces genetic variation
  • genetic variation is essential for survival
  • genotype gives an organism the potential to show a particular characteristic
  • degree to which the characterisitc is shown is affected by the environment

Types of variation:

  • most charcterisitcs are controlled by a numbr of genes
  • this is known as continuour variation
  • the charcaterisitc shows gradation e.g. height
  • clear cut characters are controlled by a single gene
  • this is known as discontinos variation
  • the gene may have 2 or more alleles but no intermediate type

Origins of variation:

non heritable variation:

  • the environment has a role in…


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