IV. Gene Flow- Migration
     A. Immigration- movement into a population (adds alleles)
     B. Emigration- movement out of a population (subtracts alleles)
V. Non-Random Mating
     A. Inbreeding- tendency to mate with an individual more closely related. Increases p^2 and q^2 (AA&aa) and decreases 2pq (Aa)
     B. Outbreeding- tendency to mate with an individual less closely related.
     C. Assortative Mating- tendency to mate with one's own morph."look" >q^2 <p^2+2pq