Unit 2 Evolution

3. structures that share the same structures but have different functions; shows common ancestry
4. structures that have a similar functions but different evolutionary origins; no common ancestor
7. type of natural selection that favors one extreme variation of a trait
10. a change in DNA
11. gradual accumulation of adaptation over time; driven by natural selection
13. type of natural selection that favors individuals with the average trait in a population
16. percentage of any allele in a population's gene pool
18. group of organisms that can interbreed and produce fertile offspring in nature
19. the physical separation of populations
20. the inability of formerly interbreeding organisms to produce offspring;includes temporal and behavioral isolation
22. an inherited trait that increases an organism's chance of survival in a particular environment
23. characteristic that is inherited; can be either dominant or recessive

1. the preferential choice of a mate based on a specific physical trait; female chooses trait
2. an alternate form of a gene
5. breeding of organisms by humans for specific physical characteristics
6. process of evolution of new species that occurs when members of similar populations no longer interbreed to produce fertile offspring
8. selection nature selecting for traits or adaptations that are best suited for the environment
9. a unit of hereditary information
12. an organism's ability to survive and reproduce to pass on its DNA to its offspring
14. structures that once had a function but currently have a reduced function or no function at all; shows common ancestry
15. type of natural selection that favors individuals with either extreme variation of a trait
17. an organism's ability to live and thrive in its environment by overcoming challenges
21. the differences in traits or genetic makeup among individuals within a sp