الفهرس | Only 14 pages are availabe for public view |
Abstract INTRODUCTION The choice of animal models for a particular kind of research is a matter of critical importance, and warrants special concern from different angles. In view of this concept, rodents have been selected as a target for the present investigation dealing with certain cytogenetical and histological aspects. The reasons lying behind this decision are attributed mainly to the high availability of different species and strains of both non-desert and desert types of these animals, easy provision of suitable mitotic figures from them as well as satisfactorily spreading of their individual chromosomes which makes their staining and illustration an easy task. In this concern, the family Dipodidae has represented the first choice for the presently intended purpose. This group includes weakly specialized forms (Jumping mice) as well as highly specialized desert forms which are known as jerboas. Worthwhile is that the latter group has received marked interest from the evolutionary point of view. |