SATELLITE BODIES

· 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 satellite chromosomes

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