With the results from the previous chapter as a basis, additional factors can be added to the simulation, allowing it to be applied to the study of problems directly relevant to human origins. The two principal additional factors employed in this chapter are migration and selective advantage.

Of the many different and interesting ways to model migration and selective advantage, the simulations presented here focus on the following situations:

1. with an amphora profile, study the unrestricted migration of species between two continents (initial population on one only);

2. with an amphora profile, study migration between three continents, where the migration patterns approximate those of the hominoids, outlined in Section 2.1;

3. with a logistic profile with interbreeding, study migration between two continents (initial population on one only) with migrations restricted in time to four different six-generation windows;

4. with the same profile as above, study ‘spatially’ restricted migration where one continent acts purely as a source continent and the other two purely as sinks (i.e. destinations only; no migration from these continents) and see the effect of different degrees of selective advantage between the source and sink continents;

5. still with the same profile as above, study unrestricted migration between all four continents, each with initial population but with species originating on one particular continent having a significant selective advantage over all the others.