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3. isolation of a population due to physical barriers such as a fence, mountain range, or body of water
5. type of natural selection in which individuals with one extreme phenotype have an advantage and the other extreme is selected against
7. collection of all the alleles present in a population
8. any characteristic that increases the fitness of an individual.
9. measurement of the ability of an individual to survive and reproduce successful offspring.
14. migration of new individuals into a population
16. describes the movement of genes/alleles/individuals between 2 neighboring populations
17. random changes in allele frequencies attributed to luck not fitness
19. state of genetic equilibrium characterized by a large population
20. the idea that those individuals best suited to their environment will achieve higher fitness
21. isolation of a population due to differences in communications, mating rituals, or other behaviors

1. when organisms will impersonate other organisms to increase fitness
2. type of natural selection in which the average phenotype has advantage and the extremes are selected against
4. hardy weinberg equation that states that all dominant alleles (p) + all the recessive alleles(q) represents al the alleles present in a population
6. isolation of a population due to differences in the timing of mating
10. when a small part of a population is separated from the rest and colonies a new area often respond differently to natural selection pressures
11. when a population experiences a rapid, drastic reduction in the number of individuals in the population
12. migration of individuals out of a population
13. selection within a population due to human inference and selection of desired traits
15. refers to the differences among individuals in a population
18. group of individuals of the same species that live in the same area at the same time and can interbreed