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Chromosomes are classified according to the position of the centromere. There are 4 types of chromosomes according to location of centromere on chromosome (chromatid arms) as 1. Metacentric 2. Acrocentric 3. Submetacentric 4. Telocentric. If the centromere is present somewhere in between, but not exactly in the middle, of the chromosome, it is called as sub metacentric chromosomes. Chromosomes having centromere exactly in the middle are called as metacentric. In acrocentric chromosomes, centromere appears subterminal, ie, with a very small and a very long arm. In metacentric chromosome, centromere is median and chromosome appears V-shaped during anaphasic movement. submetacentric chromosome, centromere is submedian, ie, one arm smaller and one arm Larger. Acrocentric chromosome has centrosome, which is situated almost closed to an end.