Unit 6 Vocabulary

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Across
  1. 1. Theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolutionary change
  2. 7. Study of the distribution of organisms around the world
  3. 9. Isolation between populations due to physical barriers
  4. 13. Process of biological change by which descendants come to differ from their ancestors
  5. 14. Process in which two or more species evolve in response to changes in each other
  6. 18. Mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individuals
  7. 19. Process by which humans modify a species by breeding it for certain traits
  8. 21. Observable change in the allele frequencies of a population over a few generations
  9. 24. Ability of a trait to be passed from one generation to the next
  10. 25. Trace of an organism from the past
  11. 27. All of the individuals of a species that live in the same area
  12. 28. Study of fossils or extinct organisms
  13. 31. Selection in which certain traits enhance mating success
  14. 32. Change in allele frequencies due to chance alone, occurring most commonly in small populations
  15. 33. Evolution of one or more closely related species into different species
  16. 35. Genetic drift that occurs after a small number of individuals colonize a new area
  17. 36. Group of organisms so similar to one another that they can breed and produce fertile offspring
  18. 38. Inherited trait that is selected for over time because it allows organisms to better survive in their environment
  19. 39. Evolution toward similar characteristics in unrelated species
Down
  1. 2. Pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype
  2. 3. Elimination of a species from Earth
  3. 4. Body part that is similar in function as a body part of another organism but is structurally different
  4. 5. Evolution of two or more species from one ancestral species
  5. 6. Principle that states that changes in landforms result from slow changes over a long period of time
  6. 8. Final stage in speciation, in which members of isolated populations are either no longer able to mate or no longer able to produce viable offspring
  7. 10. Collection of alleles found in all of the individuals of a population
  8. 11. Isolation between populations due to differences in courtship or mating behavior
  9. 12. Theory that states that the geologic processes that shape Earth are uniform throughout time
  10. 15. Proportion of one allele, compared with all the alleles for that trait, in the gene pool
  11. 16. Differences in physical traits of an individual from the group to which it belongs
  12. 17. Remnants of an organ or structure that functioned in an earlier ancestor
  13. 20. Isolation between populations due to barriers related to time, such as differences in mating periods
  14. 22. Theory that states that natural disasters shaped Earth's landforms and caused extinction of some species
  15. 23. Pathway of natural selection in which two opposite, but equally common, phenotypes are selected over the most common phenotype
  16. 26. Body part that is similar in structure on different organisms but performs different functions
  17. 29. Physical movement of alleles from one population to another
  18. 30. Measure of an organism's ability to survive and produce offspring relative to other members of a population
  19. 31. Pathway of natural selection in which intermediate phenotypes are selected over phenotypes at both extremes
  20. 34. Genetic drift that results from an event that drastically reduces the size of a population
  21. 37. Process by which one species evolves and gives rise to many descendant species that occupy different ecological niches