Unit 4: Part B (Evolution and Natural Selection)

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Across
  1. 2. Features of different species that are similar in function but not in structure and doesn’t derive from a common ancestral feature
  2. 5. a change in a population gene pool over time
  3. 6. when species are reproductively isolated from others due to differences in behavior
  4. 8. the physical separation of populations of organisms from one another due to geographical barriers.
  5. 12. biological evolution that occurs by chance
  6. 14. Process of selection conducted under human direction.
  7. 15. The preserved remains if thing that were once living
  8. 16. An organ, system, or body part that comes from a common ancestry from muiltpile organism
  9. 18. The process by which traits that improve an organism chances for survival and reproduction are passed on more frequently to future generation than those that do not.
  10. 19. How reproductively successful an organism is in its environment
  11. 21. The disappearance of a species from Earth
Down
  1. 1. Changes in DNA; Genetic variation among individual
  2. 3. Structures that have no apparent function and appear to be residual parts from a past ancestor
  3. 4. organisms that are better adapted to their environment are best suited to survive and successfully reproduce
  4. 7. The separation of groups of organisms as a result of changes in their ecology
  5. 9. A heritable trait that increases an Indivdual fitness.
  6. 10. a reproductive barrier which prevents interbreeding between distinct but closely related species due to differences in the timing of mating receptivity, activity, or fertility.
  7. 11. How a new kind of plant is created
  8. 13. the process in which two or more populations of an ancestral species accumulate independent genetic changes
  9. 17. a type of reproductive isolation where two species physically cannot undergo fertilization
  10. 20. a sequence of DNA that codes for a paticular trait