✦ LIBER ✦

Heterogeneity in distribution of constitutive heterochromatin in four species of birds

✍ Scribed by Rajiva Raman; Mercy Jacob; T. Sharma

Publisher: Springer Netherlands
Year: 1978
Tongue: English
Weight: 364 KB
Volume: 48
Category: Article
ISSN: 0016-6707
DOI: 10.1007/bf00125287

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✦ Synopsis

The distribution of constitutive heterochromatin in four species of birds viz. pigeon (Columba livia), duck (Nettapus coromandelianus), myna (Sturnus contra) and jungle babbler (Turdoides striatus) has been studied. Except in the pigeon, C-bands are localised mainly on the macro.chromosomes, whereas in the pigeon the micro-chromosomes are predominantly C-band positive. In the duck, heterochromatin is restricted to the centromeres of only 3 pairs of macrochromosomes, but in myna all the macros and only a few micros are C-band positive. In the jungle babbler, irrespective of the size, almost all the chromosomes are endowed with centromeric heterochr0matin. The W chromosome is entirely heterochromatic in all the species studied. Unlike mammals, where almost all the centromeres are C-band positive, in birds there is an obvious heterogeneity in the distribution of heterochromatin.

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