Evolution and Natural Selection

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Across
  1. 3. The process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time
  2. 4. The preserved remains of plants/animals whose bodies are buried in sediment, such as sand or mud, under ancient seas, lakes and rivers
  3. 6. A heritable trait that increases an individuals fitness
  4. 7. The process by which traits that improve an organism’s chances for survival and reproduction are passed on more frequently to future generations than those that do not
  5. 9. A change in a population’s gene pool over time
  6. 13. A feature that a species inherited from an ancestor but that is now less elaborate and functional than in the ancestor
  7. 14. How reproductively successful an organism is in its environment
  8. 16. A physical incompatibility between reproductive organs of two organisms
  9. 17. Biological evolution that occurs by chance
  10. 18. The disappearance of a species from Earth
  11. 19. Similar physical features in organisms that share a common ancestor, but the features serve completely different functions
Down
  1. 1. When two populations differ in their periods of activities or reproductive cycles
  2. 2. The process by which new species are generated
  3. 3. A sequence of DNA that codes for a particular trait
  4. 5. The idea that organisms best adjusted to their environment are the most successful in surviving and reproducing
  5. 6. The process of selection conducted under human direction
  6. 8. The separation of groups of organisms as a result of changes in their ecology or in the environment in which they live
  7. 10. The physical separation of members of a population
  8. 11. Features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature
  9. 12. Changes in DNA
  10. 15. When mismatches in mating traits prevent mating between two species/populations