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Chromosomal Polymorphisms Due to Supernumerary Chromosomes and Pericentric Inversions in the Eyelidless Microteiid Lizard Nothobachia Ablephara (Squamata, Gymnophthalmidae)

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Chromosome Research : Volume 7, Issue 2, June 1999

Chromosome Research : Volume 7, Issue 1, March 1999

Chromosome Research : Volume 6

Chromosome Research : Volume 5

Chromosomal Polymorphisms Due to Supernumerary Chromosomes and Pericentric Inversions in the Eyelidless Microteiid Lizard Nothobachia Ablephara (Squamata, Gymnophthalmidae)

Content Provider	Springer Nature Link
Author	Pellegri, Katia Cristina Machado Rodrigues, Miguel Trefaut Yonenaga Yassuda, Yatiyo
Copyright Year	1999
Abstract	Cytogenetic studies were performed on eight specimens of the monotypic microteiid lizard Nothobachia ablephara, endemic of the sand dunes of the middle São Francisco river, in the semiarid caatinga, State of Bahia, Brazil. Chromosomes from fibroblast cultures were analysed after conventional, Ag-NOR staining, C-, and replication R-banding. A basic karyotype of 2n = 62, consisting mostly of subtelocentric and acrocentric chromosomes of decreasing size, was found in five specimens. Diploid number variation (2n = 63 and 2n = 64) occurred in two specimens due to the presence of one and two medium-sized subtelocentric supernumerary chromosomes (Bs). The Bs were not clearly distinguishable from the autosomes in Giemsa-stained metaphases and C-banding, but showed late replication after R-banding. Polymorphisms of pairs 1 and 5, observed in three different combinations, including acrocentrics, subtelocentrics, submetacentrics and metacentrics, were interpreted as the result of small pericentric inversions. Variation in the number of Ag-NORs was also reported. A chromosomal mechanism of sex determination of the XX:XY type is present in this species. Our data add more evidence to confirm the remarkable chromosomal variability that has been found in Gymnophthalmidae.
Starting Page	247
Ending Page	254
Page Count	8
File Format	PDF
ISSN	09673849
Journal	Chromosome Research
Volume Number	7
Issue Number	4
e-ISSN	15736849
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Human Genetics Microbial Genetics and Genomics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics

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Chromosomal Polymorphisms Due to Supernumerary Chromosomes and Pericentric Inversions in the Eyelidless Microteiid Lizard Nothobachia Ablephara (Squamata, Gymnophthalmidae)

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Chromosomal Polymorphisms Due to Supernumerary Chromosomes and Pericentric Inversions in the Eyelidless Microteiid Lizard Nothobachia Ablephara (Squamata, Gymnophthalmidae)