Evolution and Natural Selection

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Across
  1. 2. the production of new living organisms by combining genetic information from two individuals of different types (sexes).
  2. 3. the process through which populations of living organisms adapt and change.
  3. 6. something an animal does usually in response to some type of external stimulus in order to survive.
  4. 10. a change or difference in the trait.
  5. 12. the reduction in genomic variability that occurs when a small group of individuals becomes separated from a larger population.
  6. 15. the formation of new and distinct species in the course of evolution.
  7. 16. refers to the dying out or extermination of a species.
  8. 17. The shape of a bird's beak, the color of a mammal's fur, the thickness or thinness of the fur, the shape of the nose or ears are all examples of
  9. 19. the movement of genes into or out of a population
  10. 20. is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as specicide, widespread violence or intentional culling, and human population planning.
Down
  1. 1. occurs when bacteria change in response to the use of these medicines
  2. 4. asexual reproduction by a separation of the body into two new bodies
  3. 5. single-celled organisms belonging to the domains Bacteria and Archaea.
  4. 7. a mode of reproduction in which a new offspring is produced by a single parent.
  5. 8. is a diverse domain of organisms whose cells have a nucleus.
  6. 9. any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment
  7. 11. a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.
  8. 13. variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
  9. 14. the influence of closely associated species on each other in their evolution.
  10. 18. one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.