Rory's crossword puzzle

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Across
  1. 2. Masked by dominant
  2. 4. A trait always expressed when present
  3. 9. One of each gene for a trait
  4. 10. Different form of a gene
  5. 11. Genetic code combination for a trait
  6. 12. When both genes are expressed
Down
  1. 1. Physical appearance for a trait
  2. 3. Unit of inherited material carried on chromosome
  3. 5. A characteristic inherited from a parent
  4. 6. Two of the same genes for a trait
  5. 7. Study of heredity
  6. 8. Many genes together express a trait