Unit 6

2. Number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
3. Breeding organisms with specific traits in order to produce offspring with identical traits.
5. Ability of an organism to survive and reproduce in its environment
8. A group of individuals that belong to the same species and live in the same area
9. Form of natural selection in which the entire curve moves; occurs when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve
12. Movement of individuals into a population
15. Form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
18. form of natural selection in which a single curve splits into two; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle
19. form of reproductive isolation in which two populations reproduce at different times
20. movement of individuals out of an area

1. A change in the allele frequency of a population as a result of chance events rather than natural selection.
4. A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.
6. natural selection that favors average individuals in a population; results in a decline in population variation
7. change in allele frequencies as a result of the migration of a small subgroup of a population
10. A trait that helps an organism survive and reproduce
11. Combined genetic information of all the members of a particular population
13. Differences among individuals in the composition of their genes or other DNA segments
14. form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water
16. movement of alleles from one population to another
17. The resemblance of one species to another species