Sci 7 - Genetics

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Across
  1. 4. a detectable change in the environment
  2. 6. a chemical reaction within a human cell that travels along a nerve cell to the brain
  3. 7. the shorter of the two chromosomes on the special 23rd pair
  4. 9. special structures of tightly wound genes that are visible when genes are outside the nucleus
  5. 11. chemical building blocks that make up genes
  6. 12. a chemical code that contains instructions for building proteins
Down
  1. 1. the longer of two chromosomes on the special 23rd pair
  2. 2. molecules attached to our cells that can sense a stimulus and start a signal
  3. 3. special type of molecule in our bodies that can do things in our cells
  4. 5. slightly different versions of the same gene
  5. 8. physical characteristic passed down from generation to generation
  6. 10. organelle in cells that contains the genes