Natural Selection

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Across
  1. 2. ability of an organism to survive and reproduce in its environment
  2. 5. The gradual changes in gene frequencies in a population due to random events
  3. 6. dealing with the geographical distribution of animals and plants
  4. 7. the branch of biology that deals with the structure of animals and plants
  5. 8. large-scale evolutionary changes that take place over long periods of time
  6. 11. This type of isolation is a separation of species or populations so that they cannot interbreed and produce fertile offspring
  7. 12. the evolution of a biological species
  8. 14. type of similar structure found in more than one species that share a common ancestor
  9. 16. Any change across successive generations in the heritable characteristics of biological populations
  10. 17. The theory that evolution occurs slowly but steadily
  11. 18. remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species
  12. 21. type of isolation that separates populations as a result of geographic change or migration to geographically isolated places
  13. 23. the perserved trace, imprint, or remains of a plant or animal
  14. 24. a change or alteration in form or qualities
  15. 25. Punctuated Equilibrium is a theory of evolution holding that evolutionary change in the ____ record came in fits and starts rather than in a steady process of slow change
Down
  1. 1. An English naturalist who established that all species of life have descended over time from common ancestry
  2. 3. Process by which individuals that are better suited to their environment survive and reproduce most successfully
  3. 4. A ____ Tree is a chart showing evolutionary relationships as determined by phylogenic systematics
  4. 9. Natural Selection is the gradual, ____ process by which biological traits become either more or less common in a population as a function of differential reproduction of their bearers
  5. 10. Process through which early prokaryotic cells are thought to have engulfed other, smaller cells and eventually incorporated them as organelles
  6. 12. inactivity resulting from a static balance between opposing forces
  7. 13. form of reproductive isolation in which 2 populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
  8. 15. the accumulation of differences between groups
  9. 19. the branch of biology that studies the formation and early development of living organisms
  10. 20. These types of structures do not have a common evolutionary origin but are similar in function
  11. 22. a trait that helps an organism survive and reproduce