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Across
  1. 3. Selection a form of natural selection in which individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle of the curve
  2. 7. Selection the process by which organisms that are most suited to their environment survive and reproduce most successfully; also called survival of the fittest
  3. 11. change overtime; the process by which organisms have descended from ancient organisms
  4. 12. Selection a form of natural selection in which individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve
  5. 14. the study of past and present distribution of organisms
  6. 15. Frequency the number of times that an allele occurs in a gene pool, compared to the total number of alleles in that pool for the same gene
  7. 17. Effect a change in allele frequency following a dramatic reduction in the size of a population
  8. 18. the preserved remains or traces of ancient organisms
  9. 19. Effect a change in allele frequencies as a result of the migration of a small group of a population
Down
  1. 1. Equilibrium a situation in which the allele frequencies in a population remain the same
  2. 2. Selection a 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
  3. 4. Isolation a form of reproductive isolation in which two or more species reproduce at different times
  4. 5. Structures structures that are similar in function but not structure;they do not suggest common ancestry
  5. 6. Isolation a form of reproductive isolation in which two population develop differences in courtship rituals or other behaviors that prevent them from breeding
  6. 8. Structures structures that are similar in different species of common ancestry
  7. 9. Principle the principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change
  8. 10. a heritable characteristic that increases an organisms ability to survive and reproduce in an environment
  9. 13. Selection the process by which individuals select mates on the basis of heritible traits
  10. 16. Pool all the genes, including all the different alleles for each gene, that are present in a population at any one time