Evolution and Natural Selection

3. adaptation in which one species evolves to resemble another species for protection or other advantages.
4. adaptations that allow organisms to blend into their surroundings.
6. early pre birth stage of development.
8. effect -random effect that can occur when a small population settles in an area separated from the rest of the population and interbreeds, producing unique allelic variations.
13. of the distribution of plants and animals on Earth.
14. drift-random change in allele frequencies in a population.
17. structure -reduced form of a functional structure that indicates shared ancestry.
18. selection-darwin’s-term for the selective breeding of organisms selected for certain traits in order to produce offspring having those traits.
19. of a trait’s relative contribution to the following generation.
20. selection-most common form of natural selection in which organisms with extreme expressions of a trait are removed.

1. structure-anatomically similar structure inherited from a common ancestor.
2. which a large population declines in number, then rebounds.
5. trait-new feature that had not appeared in common ancestors.
7. principle-states that allele frequencies in populations stay the same unless they are affected by a factor that causes change.
9. changes in groups of living organisms over time.
10. structure-structure that has the same function but different construction and was not inherited from a common ancestor.
11. selection-process in which individuals with average traits are removed, creating two populations with extreme traits.
12. trait-more primitive characteristic that appeared in common ancestors.
15. selection-theory of evolution developed by Darwin, based on four ideas:excess reproduction, variations inheritance, and the advantages of specific traits in an environment.
16. selection-shift of a population toward an extreme version of a beneficial trait.