Genetics crossword

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Across
  1. 2. when an organism has two identical alleles for a particular gene.
  2. 5. changes to the genetic material of an organism.
  3. 6. the physical characteristics of an organism.
  4. 9. when an organism has two different alleles for the same gene.
  5. 10. the location on the chromosome that contains the instructions for a particular trait.
Down
  1. 1. a tool scientists use to investigate the possible combinations of genetic crosses.
  2. 3. the descendants of a person, animal, or plant.
  3. 4. the genetic makeup of an organism.
  4. 7. the allele whose expression is masked by the dominant allele.
  5. 8. the allele that masks the expression of the recessive allele.