Evolution and Natural Selection

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Across
  1. 1. is an early, pre-birth stage of an organism's development.
  2. 7. an extreme version of a trait makes an organism more fit.
  3. 9. traits are newly evolved features
  4. 10. Darwin's study of the distribution of plants and animals around the world.
  5. 13. traits are more primitive features
  6. 15. used for the same purpose and can be superficially similar in construction but are not inherited from a common ancestor.
  7. 18. the most common form of natural selection.
  8. 19. The process of directed breeding to produce offspring with desired traits,selective breeding.
  9. 20. anatomically similar structures inherited from a common ancestor
Down
  1. 2. one species evolves to resemble another species.
  2. 3. occurs when a population declines to a very low number and then rebounds.
  3. 4. a process that splits a population into two groups.
  4. 5. structures that are the reduced forms of functional structures in other organisms
  5. 6. A measure of the relative contribution that an individual trait makes to the next generation.
  6. 8. selection change in frequency of a trait is based on the ability to attract a mate.
  7. 11. allows organisms to become almost invisible to predators.
  8. 12. drift Any change in the allelic frequencies in a population that results from chance.
  9. 14. occur when a small sample of a population settles in a location separated from the rest of the population.
  10. 16. those less equipped would die, while those more equipped would survive.
  11. 17. define cumulative changes in groups of organisms through time.