Unit 7 ap bio

4. When animals of two different species mate, their hybrid offspring can be unhealthy or sterile (2 words)
5. external agents which affect an organism's ability to survive in a given environment (2 words)
7. principle stating that the genetic variation in a population will remain constant from one generation to the next (3 words)
9. the change in allele frequencies that occurs over time within a population
10. one extreme phenotype is favored (2 words)
14. an organism's ability to survive and reproduce in a given environment
17. same structure different function (2 words)
18. offspring that have a lower rate of survival than the parent species (3 words)
19. the process through which populations of living organisms adapt and change (2 words)
20. differences in breeding schedules (2 words)

1. both extreme values are favored (2 words)
2. a group of the same species living in the same area
3. intermediate is favored (2 Words)
6. the formation of new and distinct species in the course of evolution
8. same function different structure (2 words)
11. The separation of groups of organisms as a result of changes in their ecology or in the environment in which they live (2 words)
12. where the zygote cannot develop properly and dies (2 words)
13. when species are reproductively isolated from others due to differences in behavior (2 words)
15. the process by which humans choose individual organisms with certain phenotypic trait values for breeding.
16. evolution of groups larger than an individual