Evolution review

5. selection that favors individuals with either extreme
6. occurs when natural selection favors one of the extreme variations
8. formation of a new species from an existing one
10. genetic drift occurring as a result of most of the population being destroyed by disaster
11. separation of species so they cannot interbreed and produce fertile offspring
12. structures that have different mature forms but develop from the same embryonic tissue
13. a physical separation of groups within a population that may lead to speciation
16. the ability of an organism to survive and reproduce
17. the type of selection or breeding of organisms by humans for specific traits
18. form of isolation in which 2 populations reproduce at different times

1. gradual changes in allele frequencies over time
2. process by which organisms better suited to their environment survive and reproduce
3. all the genes in a given population at a given time
4. genetic drift that occurs when just a few individuals start a new population. ___ effect
7. structure that is present in an organism but no longer serves its original purpose
9. body parts that share a common function but not structure
10. type of isolation between populations due to differences in mating
14. natural selection occurring when individuals near the middle or average have higher fitness than at either end
15. gradual changes in gene frequencies in a population due to random events