Natural Selection/Evolution Review

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Across
  1. 5. The concept that multiple species descended from a single shared ancestral organism.
  2. 7. The competition between organisms for limited resources like food, water, and shelter.
  3. 9. Anatomical remnants that were important to an ancestor but no longer serve a functional purpose for the modern organism.
  4. 14. The comparison of DNA, RNA, or amino acid sequences to determine how closely related different species are.
  5. 16. The ability of an individual to survive and produce fertile offspring in a specific environment.
  6. 17. A specific trait (behavioral, physical, or physiological) that increases an organism's fitness in its environment.
  7. 18. The ability of bacteria to survive exposure to a drug that was designed to kill them or stop their growth.
  8. 21. Similar physical features in different organisms that suggest they shared a common ancestor.
Down
  1. 1. When a species produces more offspring than the environment’s limited resources can support.
  2. 2. The total collection of fossils that provides a chronological history of life and evolutionary change.
  3. 3. A process where individuals with favorable inherited traits are more likely to survive and reproduce.
  4. 4. The physical separation of populations by barriers like mountains or water, which can lead to speciation.
  5. 6. The formal system of naming species using two parts: the Genus and the species name.
  6. 8. Any environmental factor (like a predator or climate change) that favors certain traits over others.
  7. 10. Variation The differences in DNA sequences between individuals within a population, caused by mutations and sexual reproduction.
  8. 11. The evolutionary process by which populations evolve to become distinct, separate species.
  9. 12. The study of the early development of organisms, which reveals similarities not visible in adult forms.
  10. 13. The total disappearance of a species from Earth because it can no longer survive or reproduce in its environment.
  11. 15. A branching diagram used to show the evolutionary relationships and shared traits among a group of organisms.
  12. 19. The process by which genetic information is passed from parent to offspring.
  13. 20. The change in the heritable characteristics of a population over successive generations.