Science Fair Project Encyclopedia
Nondisjunction
In biology, nondisjunction is the failure of a chromosome to split correctly during meiosis.
This results in the production of gametes which have either more or less of the usual amount of genetic material, and is a common mechanism for trisomy or monosomy.
Nondisjunction can occur in the meiosis I or meiosis II phases of cellular reproduction.
This is a cause of several medical conditions, including:
- Down Syndrome - trisomy of chromosome 21
- Patau Syndrome - trisomy of chromosome 13
- Edward Syndrome - trisomy of chromosome 18
- Turner Syndrome - only one X chromosome present
09-23-2007 01:00:40
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details