THE X CHROMOSOMES OF MAMMALS: KARYOLOGICAL HOMOLOGY AS REVEALED BY BANDING TECHNIQUES | Zendy

Sen Pathak | Zendy; A.D. Stock | Zendy

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THE X CHROMOSOMES OF MAMMALS: KARYOLOGICAL HOMOLOGY AS REVEALED BY BANDING TECHNIQUES

Author(s) -

Sen Pathak,

A.D. Stock

Publication year - 1974

Publication title -

genetics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.792

H-Index - 246

eISSN - 1943-2631

pISSN - 0016-6731

DOI - 10.1093/genetics/78.2.703

Subject(s) - biology , genetics , ploidy , karyotype , heterochromatin , autosome , constitutive heterochromatin , cytogenetics , x chromosome , chromosome , genome , chromosomal translocation , g banding , b chromosome , giemsa stain , gene

A comparison of the Giemsa-banding patterns of the X chromosomes in various mammalian species including man indicates that two major bands (A and B), which are resistant to trypsin and urea-treatments, are always present irrespective of the gross morphology of the X chromosomes. This is true in all mammalian species with the "original or standard type" X chromosomes (5-6% of the haploid genome) thus far analyzed. In the unusually large-sized X chromosomes the extra chromosomal material may be due either to the addition of genetically inert constitutive heterochromatin or to an X-autosome translocation. In these X chromosomes two major bands are present in the actual X-chromosome segment. Our data on C and G band patterns also support Ohno's hypothesis that the mammalian X chromosome is extremely conservative in its genetic content, in spite of its cytogenetic variability.

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