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Chapter 16 - Evolution of Populations
Across
4. 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
7. combined genetic information of all the members of a particular population
10. principle that allele frequencies in a population will remain constant unless one or more factors cause the frequencies to change
12. pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change; called _?_ equillibrium
13. number of times an allele occurs in a gene pool compared with the number of times other alleles occur
14. form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
15. process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms
Down
1. trait controlled by a single gene that has two alleles
2. trait controlled by two or more genes
3. change in allele frequencies as a result of the migration of a small subgroup of a population
5. separation of species or populations so that they cannot interbreed and produce fertile offspring
6. form of reproductive isolation in which two populations reproduce at different times
8. large-scale evolutionary changes that take place over long periods of time
9. 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
11. random change in allele frequencies that occurs in small populations