UNIT XI VOCAB

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Across
  1. 2. - natural selection in which individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve
  2. 5. - process by which a single species or a small group of species evolves into several different forms that live in different ways
  3. 8. - form of reproductive isolation in which two or more species reproduces at different times
  4. 10. - form of natural selection in which individuals near the center of a distribution curve have higher fitness than individuals at either end of the curve
  5. 14. - form of natural selection when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve
  6. 15. - extinction caused by slow and steady process of natural selection
  7. 17. - the evolution of a species by gradual accumulation of small genetic changes over long periods of time
  8. 18. - separation of a species or population so that they no longer interbreed and evolve into two separate species
  9. 19. - situation in which allele frequencies in a population remain the same
  10. 20. - process by which unrelated organisms independently evolve similarities when adapting to similar environments
  11. 21. - change in allele frequencies as a result of the migration of a small subgroup of a population
  12. 22. - event during which many species become extinct during a relatively short period of time
  13. 24. - principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  14. 25. - process by which two species evolve in response to changes in each other over time
Down
  1. 1. - group of individuals of the same species that live in the same area
  2. 3. - pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
  3. 4. - a change in allele frequency following a dramatic reduction in the size of a population
  4. 6. - when individuals select mates based on heritable traits
  5. 7. - 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
  6. 9. - the number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
  7. 10. - a group of similar organisms that can breed and produce fertile offspring
  8. 11. - form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
  9. 12. -random change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population
  10. 13. - formation of a new species
  11. 16. - changes in anatomy, phylogeny, ecology, and behavior that can take place in clades larger than a single species
  12. 23. - all the genes, including all the different alleles for each gene, that are present in a population at any one time