Chapter three

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Across
  1. 1. long molecule that's contains our genetic code
  2. 3. another word for sperm and egg
  3. 4. genes that combine to make the phenotype
  4. 10. relating to genes or heredity
  5. 13. refers to the sum total of all the genes that are expressed
  6. 14. influenced by many factors
  7. 16. genes with many shape
  8. 17. composed of a sequence of chemicals, a long string of amino acids
  9. 18. biological, basic structural unit of all organisms
  10. 20. also called identical twin
Down
  1. 1. also called fraternal twins
  2. 2. first few divisions of a zygote
  3. 5. inability to conceive after at least a year of trying
  4. 6. where 46 chromosomes are organized into these unit
  5. 7. male gamete
  6. 8. two cells that become one
  7. 9. refers to the sum total of the genes a person inherits
  8. 11. "many shapes"
  9. 12. process where ova are surgically removed from woman and mixed sperm
  10. 15. female gemete
  11. 19. affected by many genes