Natural Selection & Evolution

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Across
  1. 2. small variety of traits
  2. 4. structures within different species that look the same but have different functions
  3. 5. comparing early and late developmental stages of organisms
  4. 11. a structure left over from evolution and was used by ancestors but useless now
  5. 12. a group of organisms that can mate with another to produce fertile offspring
  6. 13. the formation of a new species
  7. 14. Similarities in the DNA sequence between different species can be used to determine evolutionary relationships between them
  8. 16. compares similar structures, or anatomy of different species
  9. 17. characteristics that help an organism survive and reproduce in its environment
Down
  1. 1. any change in the heritable traits within a population across generations
  2. 3. the theory stating organisms that are best adapted to an environment survive and reproduce more than others
  3. 6. shows the links or transition between species using fossils
  4. 7. large variety of traits
  5. 8. an organism from which other different organisms evolved
  6. 9. The differences in genes (characteristics) within a population
  7. 10. the combining of genes from two parents
  8. 15. random but permanent changes in the DNA sequence