Biology related words

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Across
  1. 4. biological barrier
  2. 5. protein coding fragment of DNA
  3. 9. Bible of Biology
  4. 12. brain eating organism
  5. 13. hardest worker in the lab
  6. 14. immediate source of energy for cells
  7. 15. change in heritable characteristics
Down
  1. 1. 23 pairs in human
  2. 2. animal with a backbone
  3. 3. plant eating organism
  4. 6. Father of Evolution
  5. 7. sense of smell
  6. 8. internal signalling
  7. 10. the largest bone in human body
  8. 11. amplifying DNA fragments