ch 16/17

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Across
  1. 3. one end of bell-curve has higher fitness
  2. 5. is a trait controlled by only one
  3. 6. How long ago earth was formed
  4. 8. is a group of individuals of the same species that can interbreed.
  5. 10. bodily structures that are similar in function, but not in structure.
Down
  1. 1. Dating method that used the decay of radioactive isotopes to measure the age of a rock.
  2. 2. Structures that serve no function but useful structures in earlier ancestors
  3. 4. middle of the curve has higher fitness
  4. 7. Structures-bodily structures that are similar in structure,but different in function
  5. 9. is all the genes, and their alleles, in the population.