evolution

• what is the theory of evolution?

  all of todays species have evolved from simple life forms that first started to develop over three billion years ago
• phenotype variations 


  phenotypes that exists in a population
• evolution 


  a change in the inherited characteristics of a population over time through a process of natural selection which may result in the formation of new species
• Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success.
• what happens to species that become so different in phenotypes?


  If two populations of one species become so different in phenotype that they can no longer interbreed to produce fertile offspring they have formed two new species.
• speciation 


  speciation is the development of new species due to the changes of phenotypes because of natural selection
• charles darwin theory 


  as a result of observations on a round the world expedition, backed by years of experimentation and discussion and linked to developing knowledge of geology and fossils, proposed the theory of evolution by natural selection.
• darwin suggested

  • individual organisms with a paticular species show a wide range of variation for a characteristic
  • individals with characteristics most suited to environment are more likely to survive to breed successfully
  • the characteristics that enabled these individuals to survive are passed onto the next gen
• why was darwins theory not widely accepted.?

  • theory challenged god
  • insufficient evidence when his theory was published so many scientists weren’t convinced
  • inheritance and variation was not known until. fifty years after the publication