Natural selection and evidence for evolution

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Across
  1. 4. When there are multiple alleles of one gene
  2. 5. Force which drives the frequency of alleles to change
  3. 7. There is a 99% match between chimpanzee and human genomes
  4. 10. Structures within different organisms from divergent evolution
  5. 14. An alternate theory of evolution in which organisms individually changed to suit their environment
  6. 16. A diagram which shows the proposed divergence of organisms from a common ancestor
  7. 17. Type of evolution in which organisms develop similar adaptations due to selection pressures
  8. 20. A change in the DNA of an organism - can be beneficial or deleterious
  9. 21. The mineralised imprint of past life
Down
  1. 1. When an organism cannot create fertile offspring with another species
  2. 2. The process in which certain alleles are advantageous over others within an ecosystem
  3. 3. Type of biotic selection pressure within species and between species
  4. 6. A group of organisms of the same species - unit of evolution
  5. 8. Type of evolution in which organisms come from a common ancestor
  6. 9. Structures within different organisms which serve a common function - from convergent evolution
  7. 11. The infertile offspring of a lion and a tiger
  8. 12. The different layers of rocks which build up over time
  9. 13. The bird in which Darwin studied to come up with his theory of natural selection
  10. 15. A change or feature in an organism which use uses to survive
  11. 18. Remnant structure or function from an evolutionary ancestor
  12. 19. Related to an organism's ability to survive and reproduce