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  • Genetic Drift
  • There are less genes to go around since only 2 of us are alive.
  • Gene Flow
  • Wow I am american but I'm mating with someone from Africa which will increase diversity for later generations.
  • This is a change in the gene pool of a small population due to chance. A big storm wipes out most of the elephants but a couple survive. This is totally random and results in making the gene pool smaller because there is not diversity to go around.
  • Mutations
  • Wow I just had a really bad car accident and I only have 2 bruises!
  • This is either an increase or decrease of alleles due to migration. This tends to reduce genetic differences but for humans in increases diversity. Since humans move to many different locations they spread their genes to other humans which increases diversity.
  • Non Random Mating
  • Wow she's beautiful!
  • This is a change in DNA that leads to a new phenotype which can often be bad for a population but sometimes could save them. This is often deadly and takes a long time to develop. In this example a family had a good mutation which lead to higher bone density so they didn't break their bones in a car crash.
  • Selection of a mate due to attraction. This can reduce or increase genetic variation because if many creatures in the same population are attracted to the same type of mate it would reduce genetic variation. On the other hand if someone has a different taste in mates it would increase genetic variation.
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