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  Section: Genetics » Numerical Changes in Chromosomes
 
 
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Numerical Changes in Chromosomes

 
     
 
Content
Numerical Changes in Chromosomes
Aneuploidy 
Monosomy
Nullisomy
Trisomy
Tetrasomy
Euploidy 
Monoploidy and haploidy
Polyploidy

Numerical changes in chromosomes or variations in chromosome number (heteroploidy), can be mainly of two types, namely (i) aneuploidy and (ii) euploidy. Aneuploidy means presence of chromosome number which is different than a multiple of basic chromosome number. Euploidy, on the other hand, means that the organism should possess one or more full sets of chromosomes. Let us imagine that 7 is the basic chromosome number (x)in a particular class of individuals where diploid number (in) is 14. In this case, chromosome numbers 2n = 15 and 2n = 13 would be aneuploids, while those having 2n = 7, 21, 28, 35 or 42 would be euploids. A classification of different kinds of numerical changes in chromosomes is presented in Figure 20.1.
 
Different kinds of numerical changes in chromosomes (x = basic chromosome number; 2n = somatic chromosome number).
Fig. 20.1. Different kinds of numerical changes in chromosomes (x = basic chromosome number; 2n = somatic chromosome number).
 
     
 
 
     




     
 
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