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Genetic Differentiation and Relationship Between Two Karyotype Forms of Nannospalax Ehrenbergi (Rodentia: Spalacidae) in Egypt.

Author(s)
Adel A Basyouny Shahin Department of Zoology, Faculty of Science, Minia University, 61519 El Minia, Egypt
Amira M Metwally Mohamed Department of Zoology, Faculty of Science, South Valley University, 83523 Qena, Egypt
Abdel Reheem A E l Shatter Department of Zoology, Faculty of Science, South Valley University, 83523 Qena, Egypt
Abstract
Genetic differentiation between the two karyotype forms I (2n = 60) and II (2n = 62), which have been recently recognized in the Egyptian N. ehrenbergi, was examined at 17 structural genetic loci and interrelationship was discussed. Of these 17 genetic loci, 10 (58.8%) loci were monomorphic with the same allele fixed in all individuals from both karyotype forms and only 7 (41.2%) loci were polymorphic with two different alleles. Levels of genetic variability between the two forms were relatively low and are comparatively either within the range or quite different from those of the same species occurring elsewhere. The means of expected (He) and observed (Ho) heterozygosity were 0.175 ± 0.503 and 0.124 ± 0.496, respectively, the mean percentage of polymorphic loci (P) was 29.42%, while the mean number of alleles per locus (A) was 1.30 ± 0.11. In addition, the mean levels of genetic identity (I) and genetic distance (D) were 0.932 and 0.070, respectively, indicating that the two forms were genetically highly similar. Thus, the present results are concordant with that obtained from the chromosomal, morphological and penial study and support the recent hypothesis of occurrence of new species in N. ehrenbergi. Divergence between the two species would have occurred during Pleistocene (ca 1.26 million years ago).
Publication Details
Page(s) 1671-1680
Published Journal: Pakistan Journal of Zoology, Volume: 50, Issue: 5, Year: 2018

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