unit 7

2. The theory that evolution occurs slowly but steadily
6. variety of organisms
8. A natural process resulting in the evolution of organisms best adapted to the environment.
10. physical separation of a group of individuals from others of the same species
12. a group of organisms of the same species populating a certain area
15. A change in the allele frequency of a population as a result of chance events rather than natural selection.
17. an adaptation that enables a species to blend in with its environment
19. An evolutionary pattern in which many species evolve from a single ancestral species
20. Ability of an organism to survive and reproduce in its environment
21. study of embryos and their development
22. Body parts that share a common function, but not structure

1. A characteristic that improves an individual's ability to survive and reproduce in a particular environment.
3. average phenotype achieves higher fitness
4. 1 phenotype achieves higher fitness
5. both phenotypes achieve higher fitness
7. change in allele frequencies as a result of the migration of a small subgroup of a population
9. Form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
11. Number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
13. Formation of new species
14. a reduction in the genetic diversity of a population caused by a reduction in its size
16. Any difference between individuals of the same species.
18. an adaptation in which one species looks like another species to survive