Natural Selection

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Across
  1. 4. The variety of different types of genes in a species or population.
  2. 6. A species that no longer has any known living individuals.
  3. 13. fossils that show a transition from one species to another
  4. 15. organisms produce more offspring than can survive
  5. 16. Any difference between individuals of the same species.
  6. 18. ability to survive and reproduce
Down
  1. 1. A characteristic that improves an individual's ability to survive and reproduce in a particular environment.
  2. 2. A well-tested explanation for a wide range of observations or experimental results.
  3. 3. ancestor The shared ancestor of new, different species that arose from one population
  4. 5. Natural process resulting in organisms best adapted to the environment.
  5. 7. All the genes, including all the different alleles for each gene, that are present in a population at any one time
  6. 8. A statement that describes what scientists expect to happen every time under a particular set of conditions
  7. 9. The gradual change in a species over time
  8. 10. A group of similar organisms that can breed and produce fertile offspring.
  9. 11. English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
  10. 12. change in a DNA sequence that affects genetic information
  11. 14. the formation of new species as a result of evolution
  12. 17. The preserved remains or traces of an organism that lived in the past