Linear differentiation of the C-band pattern of the W chromosome in snakes and birds |
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Authors: | Gregory A. Mengden |
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Affiliation: | (1) Department of Population Biology, Research School of Biological Sciences, Australian National University, P.O. Box 475, 2601 Canberra City, A.C.T. |
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Abstract: | Evidence is presented from C-banding studies that the W chromosome of eleven species of snakes is not homogeneous in nature but is differentiated linearly into alternating lighter and darker C positive regions. The same is true of the W chromosome of at least some birds. There is evidence from the literature indicating a similar differentiation of the Y chromosome of some mammals and here the intermediate C positive regions are deficient in highly repetitive DNA. The significance of heterochromatinization as a means of generating differentiated sex chromosomes is discussed in the light of these findings.Dedicated to Professor M.J.D. White on the occasion of his 70th Birthday |
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