Bio Unit 3

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Across
  1. 3. form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains or stretches of water
  2. 4. inherited characteristic that increases an organism's chance of survival
  3. 8. selection by humans from breeding of useful traits from the natural variation among different organisms
  4. 9. selection a process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individual because of those traits
  5. 10. form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding
  6. 11. difference among individuals in the composition of their genes or other DNA segments
  7. 13. condition that occurs when the frequency of alleles in a particular gene pool remain constant over time
  8. 16. movement of individuals out of a population
  9. 19. number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
  10. 20. movement of alleles from one population to another
  11. 21. ability of an organism to survive and reproduce in its environment
Down
  1. 1. a group of individual that belong to the same species and live in the same area
  2. 2. a change in allele frequency following a dramatic reduction in the size of a population
  3. 5. change in allele frequencies as a result of the migration of a small subgroup of a population
  4. 6. selection form of natural selection in which the entire curve moves, occurs when 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. 7. a change in the allele frequency of a population as a result of chance events rather than natural selection
  6. 12. combined genetic information of all the members of a particular population
  7. 14. migration to a new location
  8. 15. natural selection that favors intermediate variants by acting against extreme phenotypes
  9. 17. ability of an animal to look like another more harmful animal
  10. 18. selection form of natural selection in which a single curve splits into two, occurs when individuals at the upper and lower ends of distribution curve have higher fitness than individuals near the middle