Genetics crossword puzzle

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Across
  1. 4. Having two identical alleles for a certain trait
  2. 5. A tightly coiled structure made of DNA and proteins
  3. 6. When one gene masks or modifies the expression of another gene
  4. 8. A diagram showing the inheritance of a trait across generations
  5. 11. The genetic makeup of an organism
  6. 12. One of two or more versions of a gene at a given locus
  7. 14. A heritable change in the nucleotide sequence of DNA
Down
  1. 1. The specific location of a gene on a chromosome
  2. 2. Cell division that splits the chromosome number to produce gametes
  3. 3. The diploid cell formed when two gametes fuse at fertilization
  4. 7. A specific characteristic of an organism determined by genes
  5. 8. Observable physical characteristics of an organism
  6. 9. Allele whose trait is unflavored to the dominant trait
  7. 10. Allele whose trait is expressed over the recessive allele
  8. 11. Haploid reproductive cell
  9. 13. When two genes are located on the same chromosome and tend to be inherited together