Natural Selection Crossword Puzzle

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Across
  1. 1. Type of selection that results in one trait being favored over others.
  2. 7. Type of selection that results in one extreme trait being selected over others.
  3. 8. Structures that are no longer used, but were used in the ancestral species.
  4. 9. Two groups in the same species develop different traits.
  5. 10. Two groups evolve similar structures independently.
  6. 12. Process that results in high genetic variation; crossing over occurs; meiosis occurs; new organisms are created.
  7. 14. Structures that are similar in function but do not indicate shared ancestry.
  8. 15. Type of selection that results in two traits being favored in a population.
Down
  1. 2. A natural disaster dramatically shifts the allele frequency in a population.
  2. 3. A species is separated by reproductive differences.
  3. 4. Movement of organism's from one population to another changes allele frequencies in the new population.
  4. 5. A species is separated by a geographical change.
  5. 6. Favorable traits allow an organism to survive predation and reproduce.
  6. 11. Structures that are similar in structure; they indicate shared ancestry.
  7. 13. The first cell thought to be on Earth.