We started out with a fish pond and then were allowed to change any factor we wanted, related to the fish and see the changes' effects on the color of the fish.
For example, I wanted to make all of the fish red, so I made the RR become the fittest allele, made a red color most likely for fish migrating into the pond, and changed the ratio of mutations from an r allele to an R allele very high.
The pond followed a Hardy- Weinburg equilibrium when all five of these situations were true about the pond:
1) The population size must be big.
2) Mutations must be low.
3) Migration should not occur in or out of the specified area.
4) Mating is random.
5) Genotypes cannot affect a species' fitness.
When I put all of these conditions in the pond, the population and percentage of R/r alleles stayed constant. When I changed one (or all) of these conditions, the graph varied, going up and down.
In the pictures below, the first picture shows a generally constant situation. Is fluctuates, but very slightly. The second picture shows what happens to the allele percentages when the Hardy-Weinburg equilibrium is messed with or when the genes are changed by a greater force (me in this case).
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