Now showing items 1-10 of 1281
Karyotypes of some Brazilian diplopods
Intrachromosomal karyotype asymmetry in Orchidaceae
(Soc Brasil Genetica, 2017-07-01)
The asymmetry indexes have helped cytotaxonomists to interpret and classify plant karyotypes for species delimitation efforts. However, there is no consensus about the best method to calculate the intrachromosomal asymmetry. ...
Karyotype analysis in Brachiaria (Poaceae) species
(Faculty Press, 2001-01-01)
This is the first karyotype characterization of Brachiaria species. Twelve accessions belonging to five species were analysed. The basic chromosome number was x = 9 and 7, the same reported for the tribe Paniceae. Variations ...
Evaluating the karyotypic diversity in species of Hyla (Anura, Hylidae) with 2n = 30 chromosomes based on the analysis of ten species
Ten species of Hyla with 2n = 30 from Brazilian fauna were analysed cytogenetically. Hyla minuta is the unique presenting all bi-armed metacentric or submetacentric chromosomes in the karyotype, therefore, with the highest ...
Genome downsizing and karyotype constancy in diploid and polyploid congeners: a model of genome size variation
(Oxford University Press, 2014-09)
Evolutionary chromosome change involves significant variation in DNA amount in diploids and genome downsizing in polyploids. Genome size and karyotype parameters of Hippeastrum species with different ploidy level were ...
Karyotypic characterization of Ramphastidae (Piciformes, Aves)
(Sociedade Brasileira de Genética, 2002-01-01)
The karyotypes of nine species of the family Ramphastidae were determined and compared with that of the toco toucan (Ramphastos toco), the only ramphastid karyotype so far reported in the literature. Differences in the ...
Karyotype studies of some species of Dalechampia plum. (Euphorbiaceae)
Karyotype studies in eight species of Dalechampia, including 10 natural populations, revealed chromosome numbers (2n = 36, 46, 138 and 198) differing from two numbers cited in the literature (2n = 44 and 72). The basic ...
Karyotype variability in eight species of the subfamilies Loricariinae and Ancistrinae (Teleostei, Siluriformes, Loricariidae)
Loricariidae is one of the largest fish families of the world, with about 650 species separated into six subfamilies. To date, cytogenetic data on only 56 species of this family are available. In the present study, the ...
The karyotype of Sophora tetraptera (Fabaceae)
(Royal Society of New Zealand, 2003-12)
The karyotype of Sophora tetraptera (Fabaceae (Leguminosae), subfam. Papilionoideae) is reported for the first time. The chromosome number, 2n = 18, coincides with former reports and is the most common number for the genus. ...
Intrageneric karyotypic divergence in Scythrophrys and new insights into the relationship with Paratelmatobius (Anura, Leptodactylidae)
(Unione Zoologica Italiana, 2003-01-01)
Three populations of Scythrophrys from Brazil were studied cytogenetically. The karyotype found in Piraquara (Parana State) and Sao Bento do Sul (Santa Catarina State) (karyotype 1) differed from that of Rancho Queimado ...