Molecular Population Genetics and Diversity through Mutation

Forgive what may be a neophyte question but I don't understand just where you are going with this.If all you are doing is changing the frequencies of alleles being expressed without adding in mutations, then what is causing speciation. All the alleles being expressed in the daughter population are still present in the original population. What is there to cause an inability to interbreed?

But you aren't explaining how just a change i frequency, with no mutation, can give you anything that isn't already in the parent population. Just because you might have more black wolves than grey in the daughter population they are still able to breed with the parent population.What actually causes speciation? There is nothing in the new population that isn't already in the parent population. How does a change in frequency achieve what you're proposing?When Genomicus is discussing cases where only 2 changes can bring about speciation she is talking about mutations. You aren't making any changes other than the frequency of things that are already there.