Natural Selection and Evolution

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Across
  1. 2. the study of geographical distribution of plants and animals
  2. 4. structure, similar structures in different species that show common origins
  3. 7. no evolutionary change happens for a long time
  4. 8. selection, organisms with successful traits survive
  5. 13. chromosomes exchange alleles to increase genetic variation
  6. 14. evolution of a trait that allows for better success
  7. 15. physical evidence of an organism that lived long ago
  8. 16. equilibrium, new species appear suddenly in the fossil record
  9. 17. change over time
Down
  1. 1. ancestor, a predecessor that a creature share with another creature
  2. 3. record, accumulation of all fossilized remains
  3. 5. pool, all of the alleles in a population
  4. 6. any change or error in DNA
  5. 9. a group of same species that live in the same place
  6. 10. development, compare the developmental stages of different species
  7. 11. flow, individuals move from one population to another
  8. 12. drift, random events change the gene pool "survival of the lucky"