Unit 6 Vocabulary

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Across
  1. 4. Isolation between populations due to barriers related to time, such as differences in mating periods
  2. 6. Evolution of one or more closely related species into different species
  3. 7. Genetic drift that occurs after a small number of individuals colonize a new area
  4. 10. Theory that states that speciation occurs suddenly and rapidly followed by long periods of little evolutionary change
  5. 11. Inherited trait that is selected for over time because it allows organisms to better survive in their environment
  6. 14. Pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype
  7. 18. Study of the distribution of organisms around the world
  8. 20. Proportion of one allele, compared with all the alleles for that trait, in the gene pool
  9. 22. Observable change in the allele frequencies of a population over a few generations
  10. 23. Trace of an organism from the past
  11. 24. Collection of alleles found in all of the individuals of a population
  12. 25. Process by which humans modify a species by breeding it for certain traits
  13. 26. Process by which one species evolves and gives rise to many descendant species that occupy different ecological niches
  14. 29. Pathway of natural selection in which intermediate phenotypes are selected over phenotypes at both extremes
  15. 31. Theory that states that natural disasters shaped Earth's landforms and caused extinction of some species
  16. 32. Isolation between populations due to physical barriers
  17. 35. Measure of an organism's ability to survive and produce offspring relative to other members of a population
  18. 37. Process of biological change by which descendants come to differ from their ancestors
  19. 39. Evolution of two or more species from one ancestral species
Down
  1. 1. Genetic drift that results from an event that drastically reduces the size of a population
  2. 2. Remnants of an organ or structure that functioned in an earlier ancestor
  3. 3. 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
  4. 5. Ability of a trait to be passed from one generation to the next
  5. 8. All of the individuals of a species that live in the same area
  6. 9. Pathway of natural selection in which two opposite, but equally common, phenotypes are selected over the most common phenotype
  7. 12. Change in allele frequencies due to chance alone, occurring most commonly in small populations
  8. 13. Study of fossils or extinct organisms
  9. 15. Evolution toward similar characteristics in unrelated species
  10. 16. Theory that states that the geologic processes that shape Earth are uniform throughout time
  11. 17. Process in which two or more species evolve in response to changes in each other
  12. 19. Mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individuals
  13. 21. Group of organisms so similar to one another that they can breed and produce fertile offspring
  14. 24. Principle that states that changes in landforms result from slow changes over a long period of time
  15. 27. Body part that is similar in structure on different organisms but performs different functions
  16. 28. Elimination of a species from Earth
  17. 30. Isolation between populations due to differences in courtship or mating behavior
  18. 33. Body part that is similar in function as a body part of another organism but is structurally different
  19. 34. Physical movement of alleles from one population to another
  20. 36. Selection in which certain traits enhance mating success
  21. 38. Differences in physical traits of an individual from the group to which it belongs