Evolution and Natural Selection

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Across
  1. 8. A change in the DNA sequence of an organism.
  2. 10. The separation of one group of organisms from another.
  3. 12. The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
  4. 15. The fact or process of a species, family, or other group of animals or plants becoming gone forever.
  5. 16. The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
  6. 17. Any net directional change or any cumulative change in the characteristics of organisms or populations over many generations.
  7. 19. An organisms ability to survive and reproduce in a particular environment.
  8. 20. Organisms best adjusted to their environment are the most successful in surviving and reproduring.
  9. 21. An organ, system, or body part that shares a common ancestry in multiple organisms.
Down
  1. 1. The physical separation of populations of organisms from one another due to geographical barriers.
  2. 2. A physical incompatibility between reproductive organs of two organisms.
  3. 3. The process by which humans choose individual organisms with certain phenotypic trait values for breeding.
  4. 4. How a new kind of plant or animal species is created.
  5. 5. The process in which two or more populations of an ancestral species accumulate independent genetic changes through time.
  6. 6. The change in frequency of an existing gene variant in the population due to random chance.
  7. 7. Features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature.
  8. 9. A reproductive barrier which prevents interbreeding between distinct but closely related species due to differences in the timing of mating receptivity, activity, or fertility.
  9. 11. Non-functional features fully developed and functioning in earlier species but serve little or no present purpose for an organism.
  10. 13. The basic unit of heredity passed from parent to child.
  11. 14. When species are reproductively isolated from others due to differences in behavior.
  12. 18. A change or the process of change by which an organism or species becomes better suited to its environment.