Evolution and Genes - PowerPoint PPT Presentation


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Evolution and Genes


Evolution and Genes ... of the cell contains the chromosomes that have the genes for that species A ... Selection Genetic Mutation Genes ... – PowerPoint PPT presentation

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Title: Evolution and Genes

Evolution and Genes
  • Evolution is the sum of all transformations
    undergone by a particular primitive life form
    over time

Natural Selection
  • Natural Selection is a theory developed by the
    scientist Charles Darwin to explain the evolution
    of species
  • In this theory individuals whose physical and
    behavioural characteristics are best adapted to
    their habitat have a better chance of reproducing
    and passing on their characteristics

Genetic Mutation
  • The nucleus of the cell contains the chromosomes
    that have the genes for that species
  • A gene can become mutated so that it is different
    from the normal form
  • Individuals who carry a beneficial mutation have
    a better chance of survival and therefore a
    better chance of passing on that gene through

  • Genes carry instructions that produce a
  • A characteristic is a physical, or non-physical
    property that can vary from one individual to
    another within the same species
  • Each characteristic needs at least 2
    instructions, called alleles

  • Together all of our genes make up our genetic
    code or DNA
  • An individual gets his or her genetic code from
    his/her parents
  • Half of the code comes from Mom and the other
    half from Dad
  • Mom give 1 allele for eye colour, Dad gives one
    allele for eye colour, 2 alleles genetic code
    for eye colour

Dominant vs Recessive
  • An allele (variation) for a gene can be either
    dominant or recessive
  • Dominant alleles will be displayed, which means
    if you get even one of these alleles form a
    parent you WILL have that trait
  • Recessive alleles will only be displayed if you
    get two (one recessive form mom AND one recessive
    from dad)
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