Natural Selection/Evolution

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Across
  1. 7. genetic drift that results from an event that drastically reduced the size of a population
  2. 8. isolation due to physical barriers
  3. 9. pathway of natural selection in which intermediate phenotypes are selected over phenotypes at both extremes
  4. 10. process in which 2 or more species evolves in response to changes in each other
  5. 12. physical region of alleles from one population to another
  6. 13. the gradual development of something, especially from a simple to a more complex form
  7. 15. isolation between populations due to difference in mating behavior
  8. 16. pathway of natural selection in which 2 opposite, but equally uncommon, phenotypes are selected over the most common phenotype
  9. 18. final stage in speciation, in which members of isolation population are either no longer able to mate
  10. 19. theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolution change
  11. 20. observable change in the allele freqencies of a population over a few generations
  12. 21. evolution of 2 or more species from 1 ancestral species
  13. 22. elimination of a species from Earth
  14. 23. collection of alleles found in all of the individuals of a population
  15. 24. evolution of one or more closely related species
  16. 25. isolation between populations due to barriers related to time, such as difference in mating periods or difference in the time of day that individuals are most active
Down
  1. 1. distribution in population in which allele frequency is highest near mean range value and decrease progressively toward each extreme end
  2. 2. genetic drift that occurs after a small number of individuals colonize a new area
  3. 3. process by which one species evolves and gives rise to many descendant species that occupies different ecological niches
  4. 4. change in allele frequencies due to chance alone, occuring most commonly in small populations
  5. 5. pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype
  6. 6. condition in which a population's allele frequencies for a given trait don't change from generation to generation
  7. 11. proportion of one allele compared with all the alleles for that trait
  8. 14. selection in which certain traits enhance mating success
  9. 17. evolution toward similar characteristics in unrelated species, resulting from adaptions to similar environmental conditions