Unit 7: Natural Selection

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Across
  1. 3. Structures in different species that are similar because of common ancestry
  2. 6. the principle that states that allele frequencies in a population will remain constant unless certain factors are violated
  3. 7. the effect resulting in a change in allele frequencies as a result of the migration of a subgroup of a population
  4. 8. the process by which unrelated species become more similar as they adapt to the same kind of environment
  5. 9. Structures that do not have a common evolutionary origin but are similar in function
  6. 11. a kind of speciation where new species form due to geographic isolation
  7. 12. the type of selection when individuals at one end of the curve have higher fitness than individuals at the middle or end
  8. 17. process by which individuals that are better suited to their environment survive and reproduce most successfully
  9. 18. a reproductive barrier that hinders fertilization between species before zygotic formation
  10. 19. the gradual changes in gene frequencies in a population due to random events
Down
  1. 1. Remnants of a structure that may have had an important function in a species' ancestors, but is unnecessary in the modern species
  2. 2. a kind of speciation where new species form within the same population, in the same geographic area
  3. 4. the formation of a new species as a result of change over time
  4. 5. the effect that results in genetic drift, as a result of non-selective event
  5. 8. a graded variation in a trait that parallels a gradient in the environment
  6. 9. traits that increase an organism's fitness & ability to reproduce.
  7. 10. a type of selection that is against extreme values; the curve remains in the middle
  8. 13. a measure of the reproductive success of an individual compares to others in the population
  9. 14. combined genetic information of all the members of a particular population
  10. 15. a reproductive barrier that occurs after fertilization, hindering hybrid offspring from developing
  11. 16. a group of organisms of the same species populating a given area
  12. 20. a type of selection where extreme values for a trait are favored over intermediate values