Nolan Hunter crossword

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Across
  1. 2. in the nucleus
  2. 5. extra chromosome
  3. 7. low
  4. 8. card grading
  5. 9. average
Down
  1. 1. brains
  2. 3. rhymes with chopped
  3. 4. sad heart
  4. 6. woooooop!