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Across
  1. 2. Mutation: An exchange of one letter on the genetic code for another
  2. 3. An addition of one letter on the genetic code.
  3. 5. A unit of heredity
  4. 8. these features support successful survival and reproduction in the new environment become more common; those that do not become less common
  5. 9. What DNA is made of.
  6. 10. Subtraction of one letter on the genetic code
Down
  1. 1. The ability to develop an immunity to a chemical from a mutation.
  2. 4. When a trait is able to be passed from parent to offspring (from today).
  3. 6. One base is changed to a different base. It may or may not affect the amino acid
  4. 7. A sudden change in a gene, trait or segment of DNA.