Science

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Across
  1. 3. -How reproductively successful an organism is in its environment
  2. 5. -A sequence of DNA that codes for a particular trait
  3. 8. selection -The process of selection conducted under human direction
  4. 10. -The disappearance of a species from Earth
  5. 12. isolation -a form of reproductive isolation that prevents two different species from interbreeding with one another.
  6. 13. -“Change over time” a change in a populations gene pool over time.
  7. 15. isolation -refers to a population of animals, plants, or other organisms that are separated from exchanging genetic material with other organisms of the same species.
  8. 16. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
  9. 18. -A heritable trait that increases an individuals fitness
  10. 19. isolation -occurs when populations of the same species begin to develop different behaviors that are not recognized or preferred by members in another population.
  11. 20. structure -the retention during the process of evolution of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species.
Down
  1. 1. selection -Traits that improve an organisms chances for survival and reproduction are passed on more frequently to future generations than those that do not
  2. 2. drift -Biological evolution that occurs by chance
  3. 4. isolation -occurs when two species that could interbreed do not because the species live in different areas
  4. 5. divergence -the process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time
  5. 6. -changes in DNA
  6. 7. structure -are organs or skeletal elements of animals and organisms that, by virtue of their similarity, suggest their connection to a common ancestor.
  7. 9. structure -features of different species that are similar in function but not necessarily in structure
  8. 11. isolation -isolated in time,' so this is a mechanism that prevents species from mating because they breed at different times.
  9. 14. of the fittest -suggested that organisms best adjusted to their environment are the most successful in surviving and reproducing.
  10. 17. -Process by which new species is generated