chapter 17 and 18 hon bio

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Across
  1. 4. formation of a new species
  2. 5. form of natural selection when individuals at one end of a distribution curve have fitness then individuals in the middle or at the other end of the curve
  3. 7. structures that are similar in different species of different ancestry
  4. 8. natural selection in which individuals at the upper and lower ends of the curve have higher fitness then individuals near the middle of the curve
  5. 11. structure that is inherited from ancestrs but has lost much or all of it’s original function
  6. 13. the number of times an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
  7. 14. change overtime the process by which modern orgnisms have descended from ancient organisms fossil preserved remains or traces of ancient organisms
  8. 18. a change an allele frequency following a dramatic reduction in the size of a population
  9. 21. the study of past ans present distribution of organisms
  10. 24. the movement of genes into or out of a population
  11. 25. process by which organisms that are most suited to their environment survive and reproduce most successfully, also called survival of the fittest
  12. 26. trait controlled by one gene that had 2 alleles
  13. 27. form of reproductive isolation in which 2 populations are separated bt geographic barriers such as rivers, mountains, or bodies of water, leading ot the formation of 2 separate subspecies
  14. 28. heritable characteristic that increase in organisms ability to survive and reproduce in an environment
Down
  1. 1. change in allele frequencies as a result of the migration of a small subgroup of a population
  2. 2. selective breeding of plant and animals to promote the occurrence of desirable traits in offspring
  3. 3. body parts that share a common function, but not structure
  4. 6. for of reproductive isolation in which 2 or more species reproduce at different times
  5. 9. how well and organism can survive and reproduce in it’s environment
  6. 10. situation in which allele frequencies in a population remain the same
  7. 12. principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  8. 15. form of natural selection in which individuals near the center of a distribution curve have higher fitness then individuals at the other end
  9. 16. when individuals select mate based on heritable traits
  10. 17. form of reproductive isolation in which 2 populations develop differences in courtship rituals or other behaviors that prevent them from breeding
  11. 19. all genes, including different alleles for each gene, that are present in a population at any one time
  12. 20. random change in allele frequency caused by a series of chance occurance that causes an allele to become more or less common in a population
  13. 22. trait controlled by 2 or more genes
  14. 23. a group of homotic genes clustered together that determine the head to tail identity of body parts in animals. all hox genes contain the homobox DNA sequance