Evolution & Natural Selection

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Across
  1. 4. the number of times an allele occurs in a gene pool compared to the total number of alleles in that pool for that same gene
  2. 5. many traits are controlled by two or more genes
  3. 6. structure inherited from ancestors lost much/all of original function due to different selection pressures acting on the descendant
  4. 8. the study of where organisms live now and where they and their ancestors lived in the past
  5. 9. the preserved remains or traces of ancient organisms
  6. 11. individuals at one end of a distribution curve have higher fitness than individuals in the middle/other end of the curve
  7. 13. a term used to refer to a species that has died out and has no living members
  8. 14. structures body parts that share common function, but not structure
  9. 15. the difference in rates of survival and reproduction
  10. 19. change in frequency following a dramatic reduction in the size of a population
  11. 21. describes how well an organism can survive and reproduce in its environment
  12. 25. situation in which allele frequencies change as a result of the migration of a small subgroup of a population
  13. 26. a kind of random change in allele frequency
  14. 27. two of more species reproduces at different times
  15. 28. two populations differences in courtship rituals or other behaviors that prevent them from breeding
  16. 29. a trait controlled by only one gene
  17. 30. process by which organisms with variations most suited to their local environment survive and leave more offspring
Down
  1. 1. they compare stretches of DNA to mark the passage of evolutionary time
  2. 2. when a population not evolving, allele frequencies in its gene pool does not change, population is in __________
  3. 3. a practice in which individuals select mates based on heritable traits, such as size, strength, or coloration
  4. 7. structures that are shared by related species and that have been inherited from a common ancestor
  5. 10. individuals near the center of a distribution curve have higher fitness than individuals at wither end of the curve
  6. 12. individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve
  7. 16. selective breeding of plants and animals to promote the occurrence of desirable traits in an offspring
  8. 17. two populations separated by geographic barriers (rivers/mountains/water) leading to the formation of two separate subspecies
  9. 18. all the genes, including all the different alleles for each gene, that are present in a population at any one time
  10. 20. the process of change over time
  11. 22. the formation of new species
  12. 23. any heritable characteristics that increases an organism's ability to survive and reproduce in its environment
  13. 24. a population or group of populations whose members can interbreed and produce fertile offspring