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