Mechanisms of change

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Across
  1. 5. hypothesis proposes that early eukaryotic cells acquired the precursors of mitochondria and chloroplasts by engulfing certain types of bacteria,
  2. 8. evolution Unrelated species evolve similar traits,
  3. 10. Change over time,
  4. 12. traits that improve an individual's ability to survive and reproduce,
  5. 14. A hypothesis that has been tested with a significant amount of data,
  6. 15. A trace of an ancient organism that has been preserved in rock,
Down
  1. 1. evolution evolution of one or more closely related species into different species; resulting inadaptations to different environmental conditions,
  2. 2. Ability of an animal to look like another more harmful animal,
  3. 3. Principle principle that states that allele frequencies in a population remain constant unless one or more factors cause those frequencies to change,
  4. 4. drift A change in the gene pool of a population due to chance,
  5. 6. Formation of new species,
  6. 7. structures A structure that is present in an organism but no longer serves its original purpose
  7. 9. changes in the genetic material,
  8. 11. selection A natural process resulting in the evolution of organisms best adapted to the environment,
  9. 13. pool All the genes, including all the different alleles for each gene, that are present in a population at any one time,