Chromosome that has only one centromere in a chromosome and forms a narrow constriction.
This section is about centromere number. For optical eyepiece, see
Eyepiece § Monocentric.
The monocentric chromosome is a chromosome that has only one
centromere in a
chromosome and forms a narrow constriction.
Monocentric centromeres are the most common structure on highly repetitive DNA in plants and animals.[1]
Structure
Monocentric chromosomes as compared to
holocentric chromosomes where the entire length of the chromosome acts as the centromere. In monocentric chromosomes there is one primary constriction and the centromere its CenH3 loci at this location.[2]
Holocentric chromosomes are found throughout the plant and animal kingdoms such as the nematode Caenorhabditis elegans.[3] Holocentric chromosomes do have an evolutionary advantage by preventing the loss of chromosome after a DNA double-strand break.[4]
Deletions, duplications and translocations can produce a
polycentric chromosome. This is troublesome for cells that divide often since at the time of
anaphase the polycentric chromosome does not move to opposite poles of spindle fiber and the cell dies.[5]
^
ab{{Acentric Fragment, In: Sydney Brenner and Jeffrey H. Miller, Editor(s)-in-Chief, Encyclopedia of Genetics, Academic Press, New York, 2001, Page 2,
ISBN978-0-12-227080-2, 10.1006/rwgn.2001.1750.}}
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