Linear differentiation of the C-band pattern of the W chromosome in snakes and birds
- Department of Population Biology, Research School of Biological Sciences, Australian National University, P.O. Box 475, 2601, Canberra City, A.C.T.
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.
- 1 - sciences appliquees, technologies et medecines
- 2 - sciences biologiques et medicales
- 3 - sciences biologiques fondamentales et appliquees. psychologie
- 4 - psychologie. psychophysiologie
- 1 - Health Sciences ; 2 - Medicine ; 3 - Genetics(clinical)
- 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Genetics
- 1 - science ; 2 - genetics & heredity
- 1 - science ; 2 - biochemistry & molecular biology