SATELLITE CHROMOSOMES

Besides the centromere, one or more secondary constrictions can also be observed in some
chromosomes at metaphase called as satellite body.
 The secondary constrictions are always constant in their positions and hence can be used as
markers that identify particular chromosomes.
 If the secondary constriction contains the nucleolus organizer region, the chromosome is called
a nucleolar satellite chromosome
 In humans, chromosomes number 13, 14, 15, 21 and 22 are examples of SAT chromosomes

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