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What is the chromosome area

What is the chromosome area where the centromere is situated is termed as? How are chromosomes categorized in relation to the place 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 primary constriction the chromosomes are categorized as acrocentric, telocentric, submetacentric and metacentric.   

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