Evolution of populations

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Across
  1. 3. clock two species have been evolving independently
  2. 5. isolation population so that members can no longer interbreed
  3. 6. selection fitness than individuals at either end of the curve
  4. 8. effect dramatic reduction in the size of a population
  5. 9. selection individuals near the middle of the curve
  6. 11. isolation behaviors that prevent them from breeding
  7. 13. breed and produce fertile offspring.
  8. 15. drift allele to become more or less common
Down
  1. 1. frequency alleles in that pool for the same gene
  2. 2. selection the middle or at the other end of the curve
  3. 4. isolation two population are separated by geographic barriers
  4. 6. formation of a new species.
  5. 7. isolation two or more species reproduce at different times
  6. 10. trait two or more genes
  7. 12. gene one gene that has two alleles
  8. 14. pool population at any one time