Biology

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Across
  1. 2. A ring of muscle that controls the passage of material between digestive organs
  2. 3. , A chart tracking the inheritance of a trait through generations of a family
  3. 7. An image showing an organism's chromosomes arranged in pairs
  4. 8. An allele whose effect is masked in a heterozygote
  5. 10. A structure made of tightly coiled DNA that carries genetic information
  6. 13. The scientific term for chewing
  7. 14. The stomach enzyme that begins protein digestion
  8. 18. The rhythmic expansion of an artery felt with each heartbeat
  9. 19. The paired organs where gas exchange with the blood occurs
  10. 22. A burning sensation caused by stomach acid entering the esophagus
  11. 23. The organ that produces bile
  12. 24. A structure that prevents backflow of blood within the heart
  13. 26. A pattern where both alleles are fully expressed in the phenotype, as in AB blood type
  14. 27. The enzyme that breaks down fats
  15. 28. A lower chamber of the heart that pumps blood out
  16. 29. The inner lining layer of the digestive tract
Down
  1. 1. Having two different alleles for a gene
  2. 4. A reproductive cell containing half the normal chromosome number
  3. 5. A segment of DNA that codes for a specific trait
  4. 6. The wave-like muscle contractions that move food through the digestive tract
  5. 9. The process of drawing air into the lungs
  6. 11. , Having two identical alleles for a gene
  7. 12. The liquid, straw-colored component of blood
  8. 14. The force blood exerts on artery walls, measured in mmHg
  9. 15. The passing of traits from parents to offspring
  10. 16. The largest artery in the body, carrying blood from the left ventricle
  11. 17. The muscular tube connecting the throat to the stomach
  12. 20. The organ that stores and concentrates bile
  13. 21. A blood vessel that carries blood away from the heart
  14. 25. An upper chamber of the heart that receives incoming blood