AP Bio Unit 7 Key Vocab

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Across
  1. 2. genetic drift that occurs when the size of a population is reduced, as by a natural disaster or human actions. Typically, the surviving population is no longer genetically representative of the original population.
  2. 3. a reproductive barrier that prevent hybrid zygotes produced by two different species from developing into viable, fertile adults.
  3. 6. also called diversifying selection, describes changes in population genetics in which extreme values for a trait are favored over intermediate values.
  4. 11. structures that do not have a common evolutionary origin but are similar in function
  5. 13. the formation of new species as a result of change over time
  6. 16. form of natural selection by which the center of the curve remains in its current position; occurs when individuals near the center of a distribution curve have higher fitness than individuals at either end
  7. 18. a group of organisms of the same species populating a given area
  8. 19. principle that Earth's processes occurring today are similar to those that occurred in the past
  9. 20. when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end
Down
  1. 1. a reproductive barrier that impedes mating between species or hinders fertilization of ova if interspecific mating is attempted.
  2. 4. any trait that aids the chances of chances of survival and reproduction of an organism. traits that increase an organism's fitness & ability to reproduce.
  3. 5. change in allele frequencies as a result of the migration of a small subgroup of a population
  4. 7. process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest
  5. 8. structures in different species that are similar because of common ancestry.
  6. 9. the view that most of earth's geological features are the result of large-scale catastrophes such as floods, volcanic eruptions, etc.
  7. 10. the process by which unrelated species become more similar as they adapt to the same kind of environment
  8. 12. selection against extreme values, large or small, in a continuous trait.
  9. 14. a branching diagram that reflects a hypothesis about evolutionary relationships among groups of organisms.
  10. 15. remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species.
  11. 17. evolutionary change below the species level; change in the allele frequencies in a population over generations.