Science Exam Review Crossword

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Across
  1. 3. The number of chromosomes in the gamete of an organism.
  2. 5. The shape of DNA resembling a twisted ladder.
  3. 7. The fusion of genetic material from a spermatozoon with that of an ovum.
  4. 8. The maintenance of a stable condition in the body despite changes in the external environment.
  5. 10. A structure formed from condensed chromatin which consists of two identical chromatids attached at a centromere.
  6. 12. A segment of DNA that determines a particular genetic characteristic.
  7. 13. An ordered representation of an individual's chromosomes.
  8. 17. The longest part of the cell cycle.
  9. 18. A type of feedback mechanism which resists, regulates or corrects a change in a system.
  10. 19. An error that occurs during DNA replication.
Down
  1. 1. A structure that contains a deoxyribose, a phosphate group and one of the four nitrogenous bases.
  2. 2. The process by which blood vessels dilate to regulate internal body temperature.
  3. 4. A detector located in the brain which detects changes in the body and then acts to regulate the changes.
  4. 6. A process of nuclear division that reduces the number of chromosomes in a new cell to half the number in the original cell.
  5. 9. A cell that starts out as unspecialized but can develop into different types of body cells under certain conditions.
  6. 10. The most diverse and abundant of the four types of tissues which binds, supports and protects structures in the body.
  7. 11. The process by which two genetically identical daughter cells are produced.
  8. 14. A type of feedback mechanism which enhances or amplifies a change in a system.
  9. 15. One of the two identical halves of a chromosome.
  10. 16. A structure that contains at least two different types of tissue functioning together for a common purpose.