Evolution & Natural Selection

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