Hump Day crossword puzzle.

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Across
  1. 3. Study of the past and present distribution of organisms.
  2. 5. The number of times that an allele occurs in a gene pool
  3. 7. Selective breeding
  4. 10. Separation of a species,no longer can interbreed.
  5. 12. Trait controlled by two or more genes.
  6. 13. Structures that are similar in function
  7. 17. Humans
  8. 18. Preserved remains or traces of ancient organisms.
  9. 19. A structure that is reduced in size.
  10. 20. New species
Down
  1. 1. All the genes in a population at one time
  2. 2. Result of the migration of a small group of a population
  3. 4. species are separated by a barrier
  4. 6. Allele frequencies remain the same.
  5. 8. Trait controlled by one gene, or has 2 alleles.
  6. 9. Structures similar in different species
  7. 11. How well an organism can reproduce and survive in its enviroment
  8. 14. Survival of the fittest
  9. 15. A heritable characteristic
  10. 16. A change over time