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| Silva,Maria José de J.; Patton,James L.; Yonenaga-Yassuda,Yatiyo. |
| Comparison of G-bands from 2n = 10 and 2n = 16 karyotypes of Akodon revealed tandem fusions, pericentric inversions and Robertsonian rearrangement in autosomes and addition/deletion of constitutive heterochromatin in sex chromosomes. Cytochrome-b sequences indicate that the 2n = 10 karyotype is a new species and show it to be a sister taxon of the 2n = 14, 2n = 15 and 2n = 16 karyotypes. Indeed, this group shows a particular evolutionary situation in which a unique taxonomic unit based on morphological data can be detected, but, karyologically, it can be separated into two groups (2n = 14-15-16 and 2n = 10). Cytochrome-b sequences show a finer resolution, indicating that these four karyotypes represent three molecular entities (2n = 14-15, 2n = 16 and 2n =... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Akodon; Cytochrome-b; G-bands; Karyotypical evolution; Phylogeny. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300012 |
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| Suárez,Olga V.; Kravetz,Fernando O.. |
| Dyad encounters between male and female adults of Akodon azarae (Fischer, 1829) were analyzed by means of observational techniques in a natural closure during the breeding and non-breeding seasons. The animals were held in observation during 21 days, with daily 15-minute recordings of interindividual separation distance, relative displacements, characteristics of the male-female interaction, copulation, and construction and exclusive or shared use of nests by each pair. The couples, which bred successfully, showed, on average, the longest separation distance between male and female allowed by the closure. During the first two weeks of gestation the females exhibited more displacements than their respective mates did. The male-pregnant female encounters... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Akodon; Breeding; Behavior; Muridae. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212001000200023 |
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| Fernández Feijóo,María Eugenia; Dejean,Cristina B; Gómez,Martín A; Espinosa,María Beatriz. |
| The amelogenin gene, AMEL, encodes an important protein for tooth enamel formation during development. It is highly conserved among mammals. The AMEL gene, which is located in sex chromosomes in humans, exhibits a length polymorphism for the X and Y copies of the gene. This length polymorphism has been reported in several mammal species, and the differences between the X and Y chromosomes are used for sex determination by amplifi cation of the polymorphic regions. In this work, we analyzed AMEL in Akodon azarae and Lagostomus maximus. In order to assess the identity of the individuals and verify the presence or absence of chromosomal rearrangements, a cytogenetic study was performed. To amplify the AMEL region, specifi c primers were designed using the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amelogenin; AMELX; AMELY; Lagostomus; Akodon. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332010000100003 |
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