Evolution Vocabulary

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Across
  1. 1. __ isolation: form of reproductive isolation in which two populations are separated by geographic barriers such as rivers, mountains, or bodies of water, leading to the formation of two separate subspecies
  2. 3. (two words)selective breeding of plans and animals to promote the occurrence of desirable traits in offspring
  3. 5. (two words) a change in allele frequency following a dramatic reduction in the size of a population
  4. 6. (two words) evolution towards similar characteristics in unrelated species
  5. 10. (two words) movement of alleles into or out of a population due to the migration of individuals
  6. 11. an evolutionary process in which one species splits into two or more species
  7. 13. ___ isolation; form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
  8. 15. __ structures: structures that do not have a common evolutionary origin but are similar in function
  9. 16. (two words) all the genes, including all the different alleles for each gene, that are present in a population at any given time
  10. 18. term used to refer to the species that has died out and has no living members
  11. 19. ___ selection: a type of natural selection in which extreme variations of a trait are selected against
  12. 22. (two words) an ancestor that two or more species have in common
  13. 24. trait that helps organisms of a particular species to survive and reproduce in their unique environment
  14. 27. ___ selection: natural selection in which individuals at one end of the phenotypic range survive more successfully than do other individuals
  15. 30. (two words) situation in which allele frequencies in population remain the same
  16. 31. the diversity of life forms in an environment
  17. 32. __ structure: remnant of a structure that may have had an important function in a species' ancestors, but no clear function in the modern species
Down
  1. 2. process by which two species evolve in response to changes in each other over time
  2. 4. (two words) process by which organisms better adapted to their environment tend to survive and produce more offspring
  3. 7. ___ selection: natural selection in which individuals at the upper and lower ends of the curve have higher fitness that individuals near the middle of the curve
  4. 8. (two words) structures in different species that are similar because of common ancestry
  5. 9. __ isolation: form of reproductive isolation in which two or more species reproduce at different times
  6. 12. change over time
  7. 14. (two words)history of life as documented by fossils, the remains or imprints of the organisms from earlier periods preserved in sedimentary rock
  8. 17. ___ isolation: separation of species or population so that they no longer interbreed and evolve into different species
  9. 20. a proposed explanation in evolutionary biology stating that new species arise from the result of slight modifications (mutations and resulting phenotypic changes) over many generations
  10. 21. (two words) process by which a single species or a small group of species evolves into several different forms that live in different ways
  11. 23. (two words) phenomenon by which allele frequencies in a population change as a result of random events
  12. 25. __ mating: mating among individuals on the basis of their phenotypic similarities or differences, rather than mating on a random basis
  13. 26. (two words) change in allele frequencies as a result of the migration of a small subgroup of a population
  14. 28. how well an organism can survive and reproduce in its environment
  15. 29. ___equilibrium: the theory that new species evolve suddenly over relatively short periods of time (a few hundred to a thousand years)