vocabulary

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Across
  1. 4. theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolutionary change
  2. 5. one uncommon phenotype is selected over a more common phenotype
  3. 7. proportion of one allele compared with all the alleles for that trait in the gene pool
  4. 9. intermediate phenotypes are selected over phenotypes at both extremes
  5. 11. genetic drift that results from an event that drastically reduces the size of a population
  6. 13. isolation between populations due to physical borders
  7. 15. populations allele frequencies for a given trait to not change from generation to generation
  8. 16. collection of alleles found in all of the individuals of a population
  9. 18. evolution of two or more species from one ancestral species
  10. 19. one or more closely related species into different species resulting from adaptations to different environmental conditions
  11. 21. different kinds of living organisms are thought to have developed and diversified from earlier forms
  12. 22. certain traits enhance mating success traits are passed on to offspring
  13. 24. related to time such as differences in mating periods or differences in the time of day that individuals are most active
  14. 25. change in allele frequencies due to chance alone,most commonly in small populations
Down
  1. 1. two opposite, equally uncommon, phenotypes are selected over the most common
  2. 2. similar characteristics in unrelated species resulting from adaptations to similar environmental conditions
  3. 3. members of isolated populations are either no longer able to mate or no longer to produce viable offspring
  4. 6. allele frequency is highest near the mean range and decreases toward each extreme end
  5. 8. one species evolves and gives rise to many descendant species that occupy different ecological niches
  6. 10. differences in courtship or mating behavior
  7. 12. two or more species endure in response to changes in each other
  8. 14. observable change in the allele frequencies of a population over a few generations
  9. 17. physical movement of alleles from one population to another
  10. 20. elimination of a species from earth
  11. 23. genetic drift that occurs after a small number of individuals colonize a new area