AP Biology Natural Selection

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Across
  1. 6. ____selection is when organisms with certain traits are bred until the population has that trait
  2. 10. heritable trait that helps the survival and reproduction of an organism in its present environment
  3. 11. the change in the genetic composition of a population from generation to generation
  4. 13. structures in different species that are similar because of common ancestry
  5. 14. able to be passed from parents to offspring through DNA.
  6. 16. ____ selection is when individuals on both extremes of a phenotypic range survive or reproduce more successfully than do individuals with intermediate phenotypes
  7. 18. relationship between two organisms in which one organism benefits and the other is unaffected
  8. 20. ____selection is when intermediate phenotypes survive or reproduce more successfully than do extreme phenotypes
  9. 21. non living
  10. 23. genetic drift resulting from the reduction of a population, typically by a natural disaster, such that the surviving population is no longer genetically representative of the original population
  11. 26. an organism's genetic makeup, especially the alleles it carries
Down
  1. 1. competition within a species
  2. 2. tree diagram that represents a hypothesis about the evolutionary history of a group of organisms
  3. 3. when a species completely disappears from Earth
  4. 4. developed the theory of evolution based on natural selection
  5. 5. relationship between two organisms of different species where one benefits and the other is harmed
  6. 7. ____effect occurs when a few individuals become isolated from a larger population and form a new population whose gene pool composition is not reflective of that of the original population.
  7. 8. structures with similar function because of similar environments
  8. 9. relationship in which both species benefit
  9. 12. allele _______ is the proportion of a specific allele in a population's gene pool
  10. 15. differences between members of the same species
  11. 17. physical traits
  12. 19. offspring of two closely related individuals, not of the same species
  13. 22. selective pressures that include predators and disease
  14. 23. the study of how species are distributed geographically across Earth
  15. 24. random changes in DNA sequence
  16. 25. relative reproduction success of a genotype compared to other genotypes in the same population