Evolution will not occur if
1. the sample size is large and thus everything is more evenly random
2. mating is random- there is no particularly attractive trait
3. DNA does not mutate
4. There is no differential migration, where new genes are introduced
5. phenotypes do not influence survival
p*p + 2pq + q*q = 1
p+q=1
these equations detail the rates of occurrence of alleles and genotypes.
dominant alleles are p and recessive alleles are q.
If the entire population is allowed to breed randomly, then an equilibrium will remain in the sample. 0.5 vs 0.5 dominant and recessive alleles. But if the population is separated, the final occurrence of dominant and recessive alleles will not be 0.5 vs 0.5.
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