Unit 4: Evolution and Natural Selection

2. different species that are similar in function but not in structure.
7. formation of a new species in the course of evolution.
8. evolutionary process of natural selection that fits organisms to their environment.
10. when species isolate from others due to different behaviors.
11. physical separation from one organism to another due to geographical barriers.
13. a unit of heredity transferred from a parent to its offspring.
15. a feature that a species inherited from an ancestor but is not less elaborate and functional.
17. the relative frequency of different genotypes in a small population.
18. preserved remains of plants and animals.
20. existence of organisms that are best adapted to their environment.
21. similar physical features in organisms that share a common ancestor.

1. living organisms that has developed during the history of earth.
3. reproductive isolation mechanism among sexual organisms.
4. the process in witch two or more populations of an ancestral species accumulate independent genetic changes through time.
5. a physical incompatibility between reproductive organs of two organisms.
6. the changing of the structure of a gene.
9. organisms better adapted to to their environment tend to survive and produce more offspring.
12. groups of organisms as a result of changes or in the environment in witch they live.
14. quantitative representation of individual reproductive success.
16. selection Humans choose individual organisms with certain phenotypic trait values for breeding.
19. the process of a species family or other group of plants or animals becoming extinct.