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Page history last edited by Derrick Roach 14 years, 7 months ago

Chromosome Deletion (70% of AS individuals)


Gene deletion: The total loss or absence of a segment of DNA causing different types of births defects.  It can be small, involving a single missing DNA base pair, or large involving a piece of a chromosome.                              




The reasons could be:


  • absence of reverse mutation

  • presence of a deletion loop at meiosis visualized cytologically
  • revealing of recessive lethals
  • pseudodominance[1][2]

http://www.embryology.ch/images/kimgchromaber/02abweichende/k2c_deletion.gif [3]









Back to Genetics 










  1. Mark, Lefers. 11 Jun 2004. Web. 1 Nov 2009. .
  2. 23 Oct 2009. Web. 1 Nov 2009. .
  3. 2009. Online course in embryology for medicine students, Web. 1 Nov 2009. .

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