Chromosomal polymorphism in a natural population of the northern green barbet, Megalaima zeylanica caniceps (Franklin) (Piciformes: Aves)
✍ Scribed by D. Kaul; H. A. Ansari
- Publisher
- Springer Netherlands
- Year
- 1981
- Tongue
- English
- Weight
- 388 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0016-6707
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✦ Synopsis
A chromosomal polymorphism is present in a natural population of Megalaima zeylanica caniceps. The basic karyotype of the species consists of sixteen pairs of macrochromosomes and thirty-two pairs of microchromosomes. In the eleven individuals examined, three distinct karyotypes (disregarding the sex) were encountered, resulting from an unequal translocation between the largest pair of macrochromosomes (chromosome AB) and one of the microchromosomes (chromosome CD). The homozygous karyotype, AB/ AB/CD/CD, and the heterozygouskaryotype, AB/AC/ CD/BD, are both equally frequent. Only a single individual of the other homozygous type, AC/AC/BD/BD, was captured. are based exclusively on relative length and centromerit indices of the chromosomes. Preliminary Gand C-banding studies so far did not yield clear and consistent results.
Material and methods
Eleven adult individuals (5 males and 6 females) of the northern green barbet, Megalaima zeyhnica caniceps were collected from Allahabad, Uttar Pradesh. Mitotic metaphase preparations were obtained by the routine flame-drying technique utilizing previously colchicinized bone-marrow cells. Orcein-stained testis squashes were obtained following the method of .