Unit 4 Vocab Part B

2. occurs when two populations differ in their periods of activity or reproductive cycles
3. a type of reproductive isolation where two species physically cannot undergo fertilization
7. A change in the gene pool of a population due to chance
11. Change in a kind of organism over time; process by which modern organisms have descended from ancient organisms
12. The preservation remains or traces of organisms that once lived on Earth
13. Structure that is inherited from ancestors but has lost so much or all of its original function
14. A term that typically describes a species that no longer has any known living individuals
15. Structures in different species that are similar because of common ancestry
16. A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring
19. Selection by humans for breeding of useful traits from the natural variation among different organisms
20. Structure that has the same function but different construction anf was not inherited from common ancestor
21. Physical separation of a group of individuals from others of the same species

1. The formation of new and distinct species in the course of evolution
4. The separation of groups of organisms as a result of changes in their ecology or in the environment in which they live
5. the process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time
6. A natural process resulting in the evolution of organisms best adapted to the environment
8. Isolation between populations due to differences in courtship or mating behavior
9. Process by which individuals that are better suited to their environment survive and reproduce most successfully
10. Change in a DNA sequence that affects genetic information
17. A characteristic that improves an individual’s ability to survive and reproduce in a particular environment
18. Ability of an organism to survive and reproduce in its environment