Environmental Biology - Evolution

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Across
  1. 5. How reproductively useful an organism is in their environment.
  2. 7. The process in which two or more populations of an ancestral species accumulate mutations through time, often leading to reproductive isolation and continued mutation even after the populations have become reproductively isolated for some period of time.
  3. 8. A physical incompatibility between reproductive organs of two organisms.
  4. 9. Biological Evolution That occurs by chance.
  5. 13. The process by which traits that are helpful to an organisms survival & reproduction are passed on more frequently to the next generation than those that do not.
  6. 14. The disappearance of a species from Earth.
  7. 15. A heritable trait that increases fitness.
  8. 17. 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. 18. A form of reproductive isolation, wherein habitat preferences of species lowers the probability of mating.
  10. 20. Similar physical features in organisms that share a common ancestor, but the features serve completely different functions.
Down
  1. 1. Change over time.
  2. 2. The process of selection conducted under human direction.
  3. 3. Features of an organism that are considered to have lost much or all of their original function through evolution.
  4. 4. The physical separation of populations of organisms from one another due to geographical barriers.
  5. 6. When species are reproductively isolated from others due to differences in behavior.
  6. 10. A change in DNA.
  7. 11. The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
  8. 12. The process by which new species are made.
  9. 16. Features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature.
  10. 19. A sequence of DNA that codes for a particular trait.