Evolution and Natural Selection

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Across
  1. 6. structure similar structures that evolved independently in two living organisms to serve the same purpose
  2. 8. isolation a mechanism that prevents species from mating because they breed at different times
  3. 10. a unit of hereditary which is transferred from a parent to offspring and is held to determine some characteristics of the offspring
  4. 11. structure an anatomical feature or behavior that no longer seems to have a purpose in the current form of an organism of the given species
  5. 15. the formation of new and distinct species in the course of evolution
  6. 16. isolation mating is prevented because of the separation of species resulting from the difference in their habitat
  7. 17. the biological mechanism by which organisms adjust to new environments or to changes in their current environment
  8. 18. selection the identification by humans of desirable traits in plants and animals
  9. 19. isolation a form of reproductive isolation that prevents two different species from interbreeding with one another
  10. 20. selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring
Down
  1. 1. of the fittest organisms best adjusted to their environment are the most successful in surviving and reproducing
  2. 2. structure an example of an organ or bone with similar underlying anatomical features found in different animals
  3. 3. the termination of a kind of organism or of a group of kinds usually in a species
  4. 4. the capability to perform a function based on its suitability
  5. 5. the changing of the structure of a gene resulting in a variant form
  6. 7. isolation a population of animals plants for other organisms that are separated from exchanging genetic material with other organisms of the same species
  7. 9. isolation a type of reproductive isolation
  8. 10. divergence the process in which two or more populations of ancestral species accumulate independent genetic changes through time
  9. 12. drift variation in the relative frequency of different genotypes in a small population
  10. 13. change inheritable characteristics of biological populations over successive generations
  11. 14. the preserved remains or traces of remains of ancient organisms