Discuss on the Chromosomes on the basis of the Position of Centromere

Discuss on the Chromosomes on the basis of the Position of Centromere

Different types of chromosomes on the basis of the position of centromere

Centromere: In each chromosome, in colored form of metaphase of mitosis and metaphase-2 of meiosis a colorless pan is seen called centromere. It is also called the primary constriction.

Classification of chromosomes according to the position of centromere:

The structure of chromosome in anaphase stage depends upon centromere.

The type of chromosome on the basis of the position of centromere is stated below:

(i) Metacentric: When centromere is present at the middle of the chromosome then the chromosome is called metacenric chromosome. It looks like the English letter “V”.

(ii) Sub-metacentrie: When the centromere is present slightly away from the middle. It is called the sub-metacentric chromosome, which looks like the English letter ‘L’.

(iii) Acrocentric: It is said to be an acrocentric chromosome, when centromere is present towards the end of the chromosome. It looks like the English letter ‘J’.

(iv) Telocentric: Here the centromere is strictly confined to the end of the chromosome. It looks like the English letter “I”.

(v) Acentric: Centromere is absent in this type or chromosome.

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