Structural heterozygosity in parthenogenetic populations of Cnemidophorus lemniscatus (Sauria, Teiidae) from the Amazonas valley

Peccinini-Seale, Denise Maria; Frota‐Pessoa, Oswaldo

doi:10.1007/bf00326365

Cited by 29 publications

(14 citation statements)

References 22 publications

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“…In order to increase the number of dividing cells, the specimens were injected, before colchicine treatment, with an aqueous solution of Fleischmann's yeast plus dextrose (Cole & Leavens,197 l) and incubated at 35 °C for 24 hours (Peccinini- -Pessoa, 1974). A 0.1% solution of colchicine was then injected intraperitoneally (0.2 ml/10 g of weight) and the animal was sacrificed after 5 to 24 hours.…”

Section: Methodsmentioning

confidence: 99%

Chromosome mechanisms of sex determination, G- and C-band patterns and nucleolus organizer regions in Tropidurus torquatus (Sauria, Iguanidae)

et al. 1983

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The mitotic and meiotic chromosomes of two groups of the iguanid lizard Tropidurus torquatus were studied after conventional staining, G-and C-banding and silver staining of nucleolar-organizer regions. Karyotypic variations involving the microchromosomes were observed in both groups and are, probably, related to the mechanisms of sex determination of the X ~X2Y/X ~X IX2X2 type in the one group, and of the XY/XX type in the other.

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Section: Methodsmentioning

confidence: 99%

Chromosome mechanisms of sex determination, G- and C-band patterns and nucleolus organizer regions in Tropidurus torquatus (Sauria, Iguanidae)

et al. 1983

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“…In some cases (e.g., Hemidactylus vietnamensis [Darevsky et al, 1984] and Lepidodactylus lugubris [Cuellar and Kluge, 1972]), there is insufficient evidence on their bisexual relatives (reviewed by Moritz and King [1985]). Some other species, notably Lepidophyma flavimaculatum (Bezy, 1972) and Cnemidophorus lemniscatus (Vanzolini, 1970;Peccinini-Seale and Frota-Pessoa, 1974;Serena, 1984), include both bisexual and parthenogenetic populations, and it has been argued that these are not hybrids, since appropriate congeners are not present near their respective distributions. However, the evidence from N. arnouxii and another parthenogenetic gekko, Heteronotia binoei (Moritz, 1983(Moritz, , 1984, shows that parthenogenetic lineages can arise from hybridization between genetically distinct populations of the same nominal species.…”

Section: The Distribution Ofparthenogenesis Inmentioning

confidence: 99%

PARTHENOGENESIS IN THE TROPICAL GEKKONID LIZARD,NACTUS ARNOUXII(SAURIA: GEKKONIDAE)

Moritz

1987

Evolution

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found only females in a series of 51 specimens ofN. arnouxii from American Samoa. Preliminary data (discussed below) suggest that these represent a unisexual species that reproduces parthenogenetically.In this paper, the geographic distribution of bisexual and parthenogenetic populations is estimated from the sex ratio of museum samples of N. arnouxii. This analysis is complemented by assays ofchromosomal and electrophoretic variation in freshly collected specimens from bisexual and parthenogenetic populations.Evolution, 41(6), 1987, pp. Abstract.-As currently diagnosed, Nactus arnouxii includes unisexual and bisexual populations. The geographic distribution of each type was estimated by sex-ratio analysis of samples from southwestern Pacific islands. Males were absent from southern Vanuatu (excluding Aneityum), New Caledonia, andall islands to the east that have been sampled. Both types of populations appear to be present on Aneityum. Chromosome and protein analyses showed that the bisexual populations are highly polytypic and probably consist of more than one biological species. The unisexual N. arnouxii were diploid, highly heterozygous, and showed no genetic segregation. The absence of segregation suggests clonal reproduction, substantiating parthenogenesis. The high heterozygosity ofthe unisexuals indicates their origin through hybridization. One parent was genetically similar to the extant bisexual population from northern Vanuatu. The other parent has not been identified, but its genetic characteristics are predicted by phylogenetic analysis.

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“…In Sauria, stimulation has been obtained through (a) the production of small hemorrhages shortly before colchicine injection (Lowe & Wright, 1966a). (b) yeast solution injection before colchicine treatment (Cole & Leavens, 1971): (c) pre-heating the animal 10 ° 15 °C above room temperature during 18 to 24 hrs either in an oven or in the cage, using lamps (Peccinini-Seale & Frota-Pessoa, 1974). Few publications have described G-, C-and Q--banding techniques.…”

Section: Techniquesmentioning

confidence: 99%

“…This method is inconvenient for describing karyotypes with heteromorphic pairs. For example, the Marudh parthenogenetic population of Cnemidophorus lemniscatus has one submetacentric chromosome which pairs with a subtelocentric (Peccinini-Seale & Frota-Pessoa, 1974) and is better described by the formula 2n = 48 (1+25+22).…”

Section: Nomenclaturementioning

confidence: 99%

New developments in vertebrate cytotaxonomy IV. Cytogenetic studies in reptiles

Peccinini-Seale

1981

Genetica

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Structural heterozygosity in parthenogenetic populations of Cnemidophorus lemniscatus (Sauria, Teiidae) from the Amazonas valley

Cited by 29 publications

References 22 publications

Chromosome mechanisms of sex determination, G- and C-band patterns and nucleolus organizer regions in Tropidurus torquatus (Sauria, Iguanidae)

Chromosome mechanisms of sex determination, G- and C-band patterns and nucleolus organizer regions in Tropidurus torquatus (Sauria, Iguanidae)

PARTHENOGENESIS IN THE TROPICAL GEKKONID LIZARD,NACTUS ARNOUXII(SAURIA: GEKKONIDAE)

New developments in vertebrate cytotaxonomy IV. Cytogenetic studies in reptiles

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