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  Section: Genetics » Numerical Changes in Chromosomes
 
 
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Tetrasomy

 
     
 
Content
Numerical Changes in Chromosomes
Aneuploidy 
Monosomy
Nullisomy
Trisomy
Tetrasomy
Euploidy 
Monoploidy and haploidy
Polyploidy
Tetrasomics have a particular chromosome represented in four doses. Therefore, general chromosome formula for tetrasomics is 2n + 2 rather than 2n + l+l, the latter being a double trisomic. All 21 possible tetrasomics are available in wheat. Besides these tetrasomics, E.R. Sears was also able to synthesize a complete set of compensating nullisomic tetrasomics (2n — 2 + 2), where addition of a pair of homologous chromosomes would compensate for the loss of another pair of homologous chromosomes. Such non-homologous chromosomes, which are able to compensate for each other, are considered to be genetically related and are called homoeologous chromosomes.

 
     
 
 
     




     
 
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