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	Provedor de dados RChHN (2) Autor BIANCHI,NESTOR O (2) BAILLIET,GRACIELA (1) BERRÍOS,SOLEDAD (1) BRAVI,CLAUDIO M (1) FERNÁNDEZ-DONOSO,RAÚL (1) LIZARRALDE,MARTA S (1) MARTÍNEZ-MARIGNAC,VERÓNICA L (1) MERANI,MARÍA S (1) PAGE,JESUS (1) VIDAL-RIOJA,LIDIA (1) Mais... Palavra-chave Akodon molinae (1) Robertsonian chromosome polymorphism (1) Sigmodontinae (1) Synaptonemal complex (1) Trivalents (1) Y-specific Alu inserts (1) YAP+ chromosomes (1) YAP+ lineages (1) Mais... Tipo do documento Journal article (2) Ano 2001 (2) País Chile (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Robertsonian chromosome polymorphism of Akodon molinae (Rodentia: Sigmodontinae): analysis of trivalents in meiotic prophase RChHN FERNÁNDEZ-DONOSO,RAÚL; BERRÍOS,SOLEDAD; PAGE,JESUS; MERANI,MARÍA S; LIZARRALDE,MARTA S; VIDAL-RIOJA,LIDIA; BIANCHI,NESTOR O. Akodon molinae (with 2n = 42-43-44 and an FN = 44) shows a remarkable polymorphism of chromosome 1 in natural and laboratory populations. Specimens 2n = 42, named single homozygotes (SH), have a chromosome pair 1 formed by two large metacentric chromosomes. Specimens 2n = 3, heterozygotes (Ht), have one chromosome 1 and two medium-sized subtelocentric chromosomes, 1a and 1b, which are homologous with the long and short arms of chromosome 1 respectively. Specimens 2n = 44 are double homozygotes (DH), with just two pairs of medium-sized subtelocentric chromosomes, 1a and 1b. Analysis of meiotic metaphases I and II showed that anomalous segregation occurs more frequently in spermatocytes carrying the 1a and 1b chromosomes. This would disturb gametogenesis and... Tipo: Journal article Palavras-chave: Akodon molinae; Sigmodontinae; Robertsonian chromosome polymorphism; Trivalents; Synaptonemal complex. Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000016 Tracing the origin and geographic distribution of an ancestral form of the modern human Y chromosome RChHN BRAVI,CLAUDIO M; BAILLIET,GRACIELA; MARTÍNEZ-MARIGNAC,VERÓNICA L; BIANCHI,NESTOR O. We screened a total of 841 Y chromosomes representing 36 human populations of wide geographical distribution for the presence of a Y-specific Alu insert (YAP+ chromosomes). The Alu element was found in 77 cases. We tested five biallelic and eight polyallelic markers in 70 out of the 77 YAP+ chromosomes. We could identify the existence of a hierarchical and chronological structuring of ancestral and derived YAP+ lineages giving rise to four haplogroups, 14 subhaplogroups and 60 haplotypes. Moreover, we propose a monophyletic origin for each one of the YAP+ lineages. Out-of-Africa and out_of-Asia models have been suggested to explain the origin and evolution of ancestral and derived YAP+ elements. We analyse the evidence supporting these two hypotheses and... Tipo: Journal article Palavras-chave: YAP+ chromosomes; YAP+ lineages; Y-specific Alu inserts. Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000018 Registros recuperados: 2 Primeira ... 1 ... Última

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