Evolutionary Mechanisms

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Across
  1. 6. Selection natural selection that favors a particular trait so that it is present in virtually every member of a population
  2. 7. theory hypothesis that has been tested repeatedly and that is supported by considerable evidence
  3. 8. dimorphism differences in the appearance or behavior of male and female members of a species
  4. 10. all the members of one species living in the same place
  5. 17. effect loss of genetic diversity in a population in which the number of individuals able to reproduce is limited
  6. 19. development of a new species
  7. 21. flow movement of alleles into and out of a population as individuals join and leave, increasing or decreasing genetic variation in the population
  8. 23. stage of meiosis in which segments of DNA are rearranged
  9. 24. species fossil species that represents an intermediate stage in the evolution of one species to another
  10. 26. variation genetic diversity that is essential to natural selection; produced by mutation, sexual reproduction, and gene flow
  11. 28. degree to which an organism's traits allow it to survive and reproduce
  12. 30. shifts in allele frequencies in the gene pool of a population that are large enough to generate a new species
Down
  1. 1. isolation separation of two populations by a physical or behavioral barrier that prevents interbreeding
  2. 2. selection process of breeding an organism for certain traits
  3. 3. permanent change in an organism's genetic makeup
  4. 4. selection over many generations, traits that improve an organism's chance of survival tend to be passed on, while those that do not tend to die out
  5. 5. shifts in allele frequencies in the gene pool of a population that are not large enough to generate a new species
  6. 9. inherited trait that increases an individual's fitness
  7. 11. Selection natural selection that disfavors a particular trait so that it becomes extremely rare in a population
  8. 12. change in the genetic makeup of a population over time
  9. 13. group of organisms that commonly interbreed and produce fertile offspring
  10. 14. effect loss of genetic diversity in a population formed by a small number of individuals from a more diverse original population
  11. 15. structure body part that has lost its original function through evolution
  12. 16. pool set of all of the alleles for each gene in all of the individuals in a population
  13. 18. Selection natural selection based on the fact that individuals with certain traits are more likely to be chosen as mates
  14. 20. physical or behavioral characteristic
  15. 22. principle observation that the proportions of alleles in the gene pool do not change over time in a population that is not evolving
  16. 25. remnant or imprint of an ancient organism preserved in rock
  17. 27. drift random changes in a population's gene pool that are not the result of natural selection
  18. 29. structures body part that share a common evolutionary origin with body parts in other organisms but may have a different function