nakiya.johnson biology - process of evolution

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  • variation
  • natural selesction
  • geographic isolation
  • this example shows the process of variation because the cave started off with black bats. there has been some process like a mutation or random fertilization to end up with an offspring of white bats.
  • Directional pattern 
  • this demonstrates natural selection because the black bats have a higher chance of living since they blend in with the cave. the white bats have a higher chance of dying because they don't blend in as well as the black bats 
  • Genetic drift
  • the bats are separated by the river which causes their genes traits to be carried on either side of the river. this may cause them to have mutations and they might change color over tike to adapt to their side of the river. this could cause different species of bats.
  • where did evolution occur?
  • directional pattern here is the fact that the black bats can live because their predator might not be able to see them as well but for the white bats they probably is seen more easier in the dark and gets captured more 
  • this shows genetic drift because the frequency of alleles changed randomly causing what was black bats to what is now white bats. the genes in the white bat had more offspring by chance than the black colored bats 
  • this shows signs of evolution because for the bats to start off black and end up white, there had to be changes. the cause of this change was the cave. there was something that made the cave appear lighter so the bats had to change over time into lighter colored bats for a higher chance of survival. the black bats died off quicker because they were easier to see 
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