Natural Selection

2. (two words) Difference in courtship or mating behaviors that cause two species to be unable to successfully interbreed.
8. Producing more offspring than can possibly survive.
10. An inherited trait that allows members of a species to survive and reproduce better than others.
11. (two words) Process in which certain traits increase mating success and therefore become more common in the population.
13. (two words)When humans choose which organisms mate to try to obtain specific traits in the offspring.
16. The scientific theory that explains how life on earth has changed over time.
18. The movement of genes (organisms) in and out of populations. If this is low, there is an increased chance of speciation.
20. (two words) When nature acts on phenotypes to increase the population of those who have traits that allow them to survive and reproduce better than others.
21. (two words)The actual structures of the organisms prevent them from successfully mating.

1. (two words)Physical barriers divide a population and make it impossible for them to successfully interbreed.
3. (two words) Type of selection in which males exhibit a certain trait that females chooses. Females pick.
4. (two words) Timing of reproductive periods prevents mating.
5. (two words) Species may occur in the same region, but occupy different habitat niches so they rarely encounter each other.
6. (two words)When individuals from two populations are no longer able to mate successfully. This is the final stage of speciation.
7. (three words) This type of genetic drift occurs when a random catastrophic event wipes out most of a population.
9. Small differences in traits among members of a population that may be selected for or against.
12. (two words) Type of selection in which males compete for females.
14. (two words) This type of genetic drift occurs when a small part of a population leaves to form a new colony/ population.
15. The rise of two or more species from a single species.
17. (two words) This is the change in allele frequency due to chance occurrences It causes a loss of genetic diversity and is more common in smaller populations.
19. Any group of organisms that live in the same general area that can successfully mate and produce fertile offspring.