Evolution and Natural Selection

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Across
  1. 5. A change in the gene pool of a population due to chance
  2. 6. When an organism changes to fit in better in a certain environment.
  3. 7. Shows the cladistic relationship between a number of species
  4. 10. Refers to genetic drift resulting from drastic reduction in population size
  5. 13. When a population may gain or lose alleles when fertile individuals move into or out of a population or when gametes are transferred between populations
  6. 14. When bone/organ structures are similar due to common ancestry. Very good evidence to support evolutionary relationships
  7. 17. Occurs when descendants of a single ancestor diversify into species that each fit different parts of the environment
  8. 18. Provides evidence that life on Earth has changed over time
  9. 19. A change in characteristics of a speciation over several generations
  10. 20. Different versions of the same genes
Down
  1. 1. When a population has to adapt or change to fit into a certain population
  2. 2. The movement of genes in and out of a population
  3. 3. A branching diagram that show evolutionary relationships among various biological species based upon similarities and differences in their physical and genetic characteristics
  4. 4. When organisms seem outwardly similar due to adapting to similar environments. Not good evidence to support evolutionary relationships
  5. 7. Occurs when different species evolve similar traits, essentially resulting in unrelated species becoming more similar as they adapt to similar environments
  6. 8. Genetic drift that occurs when a few individuals become isolated from a larger population
  7. 9. Organisms with similar bone structures are thought to have shared a more recent common ancestor
  8. 11. The change in two or more species in close association with each other.
  9. 12. Structures that no longer serve their original purpose but are still present. Are often homologous to structures still present/working in other organisms. Evidence for evolution
  10. 15. A classification of plants and animals according to the proportion or measurable characteristics that they have in common
  11. 16. Provides the most reliable evidence for inferring evolutionary relationships and how closely two organisms may be related to one another