Evolution and Natural Selection

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