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Chromosome area where the centromere is situated

How the chromosome area where the centromere is situated is termed? How are chromosomes categorized in relation to the position of their centromere?

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The chromosome area where the centromere is situated is termed as primary constriction. In microscopic view this area is narrower (that is, a stricture) than most portion of the chromosome. According to the position of the primary constriction the chromosomes are categorized as acrocentric, telocentric, sub-metacentric and metacentric.

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