denver and paris nomenclature of chromosomes


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  • What is the Paris nomenclature of chromosome classification?

    The Paris nomenclature: This classification entails banding techniques (special staining) and therefore is more accurate in identification of chromosomes.
    The arms of the chromosomes are divided into short segments and designated numbers 1, 2 and 3 beginning from the centromere and proceeding distally.

  • What is Denver nomenclature of chromosomes?

    Denver Group classification is mainly based on: (1) the length or size of each chromosome and (2) the ratio of the length of the shorter arm to the whole length of the chromosome, which is called the centromere index (CI).

  • How are the chromosomes arranged determined in a karyotype Denver system?

    According to the Denver System, the sex chromosomes are named X and Y, while the autosomes are numbered in descending order, with the largest called chromosome 1 and the smallest chromosome 22.
    The Denver System further subdivides or classifies the chromosomes into eight groups A–G (see Table 1).
    Table 1.

  • Group A includes chromosomes pairs 1, 2, 3, group B has pairs of 4 and 5 chromosomes, group C has pairs of 6 to 12 chromosomes, group D has pairs of 13 to 15 chromosomes, group E has pairs of 16 to 18 chromosomes, group F has pairs of 19 and 20 chromosomes and group G has pairs of 21 and 22 chromosomes.

The Denver system of chromosome classification, established in 1959, identified the chromosomes by their length and the position of the centromeres.Autres questions
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