evolution and natural selection

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Across
  1. 4. : Free-living organisms often consisting of one biological cell
  2. 5. Evidence : Provides a record of how creatures evolved
  3. 9. Effect : An extreme example of genetic drift
  4. 10. : The process of adapting to something
  5. 11. Flow : The movement of genes into or out of a population
  6. 13. Cycle : Introduces its genome into a host cell
  7. 15. : Replicates only inside the living cells
  8. 16. : DNA sequences occurring at a particular gene locus
Down
  1. 1. Selection : Populations of living organisms adapt and change
  2. 2. Cells : Single-celled organisms
  3. 3. Effect : Reduction in genomic variability
  4. 6. Drift : The change in frequency of an existing gene
  5. 7. : The dying out or extermination of a species
  6. 8. Cells : Have a distinct nucleus
  7. 12. Breeding : Involves choosing parents with particular characteristics
  8. 14. Fission : A separation of the body into two new bodies