Unit 4 Vocab

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Across
  1. 4. the physical separation of members of a population
  2. 6. how reproductively successful an organism is in its environment
  3. 8. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
  4. 9. biological evolution that occurs by chance
  5. 12. the continued existence of organisms which are best adapted to their environment
  6. 14. when species are reproductively isolated from others due to differences in behavior
  7. 15. the disappearance of species from Earth
  8. 19. a physical incompatibility between reproductive organs of two organisms
  9. 20. a heritable trait that increases an individual’s fitness
  10. 21. Structures that have no apparent function and appear to be residual parts from a past ancestor
Down
  1. 1. features of different species that are similar in function but not necessarily in structure and which do not derive from a common ancestral feature
  2. 2. selection conducted under human direction
  3. 3. changes in DNA
  4. 5. new species are generated
  5. 7. 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
  6. 10. the process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time
  7. 11. similar physical features in organisms that share a common ancestor, but the features serve completely different functions
  8. 13. a sequence of DNA that codes for a particular trait
  9. 16. when two or more species reproduce at different times
  10. 17. a form of reproductive isolation, where in habitat preferences of species lower the probability of mating
  11. 18. change in a population’s gene pool over time