Genetics crossword

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Across
  1. 3. When an organism has two different alleles for a trait
  2. 8. The allele that is masked by the dominant allele
  3. 9. Complete set of genetic material
  4. 12. An organism with two identical alleles
  5. 13. The passing of traits from parents to offspring
  6. 14. Change in DNA sequence of an organism
  7. 15. Diagram that traces the occurrence of a trait
Down
  1. 1. Allele always expressed when present
  2. 2. The physical expression of a trait
  3. 4. Process by which a cell copies its DNA before dividing
  4. 5. Threadlike structure in the nucleus that carry genetic information
  5. 6. Scientist who first discovered the laws of inheritance
  6. 7. Genetic makeup of organism
  7. 10. Chart used to predict offspring probability
  8. 11. A segment of DNA that codes for a specific trait