Biology

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Across
  1. 4. Traits that are expressed
  2. 8. The study of heredity
  3. 9. Body chromosomes
  4. 11. The study of cells
  5. 13. The study of tissues
  6. 16. Combination of teo different alleles
  7. 17. Mating of two organisms
  8. 18. The classification of a living thing
  9. 19. Combination of two same alleles
  10. 20. Transfer of traits
Down
  1. 1. Containment of genes
  2. 2. The study of viruses
  3. 3. The study of the environment
  4. 5. Refers to external appearance
  5. 6. Traits that are hidden
  6. 7. The study of bacteria
  7. 10. The study of microorganisms
  8. 12. Combination of genes in an organism
  9. 14. The study of organ
  10. 15. Genes located inside the nucleus