honors bio unit 11

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Across
  1. 4. effect– a change in allele frequency following a dramatic reduction in the size of a population
  2. 5. extinction– extinction caused by slow and steady process of natural selection
  3. 9. effect– change in allele frequencies as a result of the migration of a small subgroup of a population
  4. 11. structures– body parts that share a common function, but not structure
  5. 13. to the evolution of at least two species, which occurs in response to changes in other species (have a ecological interdependent relationship)
  6. 14. selection– when individuals select mates based on heritable traits
  7. 16. pool–all the genes, including all the different alleles for each gene, that are present in a population at any one time
  8. 18. selection–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
  9. 20. isolation– form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding
  10. 21. drift–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
  11. 22. radiation (divergent evolution)-- process by which a single species or a small group of species evolves into several different forms that live in different ways
  12. 25. selection–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
Down
  1. 1. of a new species
  2. 2. isolation– form of reproductive isolation in which two or more species reproduces at different times
  3. 3. equilibrium–pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change
  4. 6. isolation– separation of a species or population so that they no longer interbreed and evolve into two separate species
  5. 7. comprising related organisms that share common characteristics and are capable of interbreeding
  6. 8. evolution of a species by gradual accumulation of small genetic changes over long periods of time
  7. 10. evolution– process by which unrelated organisms independently evolve similarities when adapting to similar environments
  8. 12. principle– principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  9. 15. gene trait–a trait that is controlled by only one gene.
  10. 17. frequency (relative frequency)-- 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
  11. 19. 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
  12. 23. selection– 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
  13. 24. extinction– event during which many species become extinct during a relatively short period of time