Karyology of four Indian snakes
نویسنده
چکیده
Cytogenetic studies were carried out on four species of Indian snakes viz Eryx conicus (Family Boidae), Naja naja naja (Family Elapidae), Vipera russelli and Echis carinatus (Family Viperidae) collected from Jammu region (J&K). Both E. conicus and N. n. naja show deviation from typical ophidian karyotype (2n=36), having 2n=34 (16 macroand 18 microchromosomes, NF=42) in E. conicus and 2n=38 (16 macroand 22 microchromosomes and NF=50) in N. n. naja. In both the species sex chromosomes are undifferentiated. V. russelli and E. carinatus exhibited typical ophidian karyotype viz 2n=36 (16 macroand 20 microchromosomes) with NF=48 and 50 respectively. They possess a well differentiated ‘ZW’ sex mechanism in female, where ‘W’ is smaller and submetacentric, a final step in the evolution of sex chromosome in snakes and ‘Z’ is larger and metacentric.
منابع مشابه
Hematology and serum biochemistry of Indian spectacled cobra (Naja naja) and Indian rat snake (Ptyas mucosa)
AIM To study the hematology and serum biochemistry parameters of Indian spectacled cobra (Naja naja) and Indian rat snake (Ptyas mucosa) and to evaluate the differences in the same between captive and wild populations. MATERIALS AND METHODS Animals were categorized into four groups, viz., wild Indian spectacled cobra (n=10), wild Indian rat snakes (n=10), captive Indian spectacled cobra (n=10...
متن کاملOn the Nature and Physiological Action of the Poison of Naja Tripudians and Other Indian Venomous Snakes.—Part I
متن کامل
The Snakes of Ceylon
This book is written partly as a memorial to the author's father who was for many years a leader in every movement for the improvement of the physical and moral condition of the people of Ceylon. It is also written with a definite scientificobject. The book gives a complete account of the snakes of Ceylon, and though it is primarily a scientific work, it will also appeal greatly to the lover of...
متن کامل