Darwin's Theory of Evolution

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Across
  1. 2. patterns in the distribution of fossils and living species tell us how modern organisms evolved
  2. 6. type of reproductive isolation that occurs because two populations are physical separated by barriers such as mountains or bodies of water
  3. 9. type of reproductive isolation where courtship rituals or other behaviors keep two populations from interbreeding
  4. 11. species change over time descending from ancestors with accumulated variations in traits
  5. 12. biologist who (incorrectly) proposed that organisms can pass down traits they acquired during their lifetimes
  6. 13. chance occurences that cause an allele to become more or less common in a population
  7. 14. a group of organisms that can reproduce with each other but not with other groups of organisms
  8. 16. the preserved remains or traces of ancient organisms
  9. 19. how well an organism can survive and reproduce in its environment
  10. 20. similar structures like the bones of vertebrate limbs that are shared by related species and suggest a recent common ancestor
  11. 21. process by which organisms most suited to their environment survive and leave more offspring
  12. 23. geologist who proposed that the Earth is much older than a few thousand years due to the rate of geological processes
Down
  1. 1. type of reproductive isolation that occurs when two or more species reproduce at different times
  2. 3. structures inherited from ancestors that lost much of their original size and function
  3. 4. economist who reasoned that the human population cannot growth indefinitely due to limited space and resources
  4. 5. the genetic definition involves a change in the _ of the gene pool over time
  5. 7. species or organism from which two or more descendant lineages (species, groups) evolved
  6. 8. geologist who proposed that past events can be explained by processes that occur in the present
  7. 10. selection type used by breeders in which they select desirable traits in crops and livestock to reproduce
  8. 15. any heritable characteristic that increases an organism's ability to survive
  9. 16. a situation in which allele frequencing change as a result of the migration of a subgroup of the population
  10. 17. field of biology that found the early stages of vertebrate development are similar offering support for evolutionary theory
  11. 18. molecular evidence that shows all species are related
  12. 22. the process by which modern organisms descended from their ancestors