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	Provedor de dados Genet. Mol. Biol. (1) RChHN (1) Autor BERRÍOS,SOLEDAD (1) BIANCHI,NESTOR O (1) Colombo,Pablo César (1) FERNÁNDEZ-DONOSO,RAÚL (1) LIZARRALDE,MARTA S (1) MERANI,MARÍA S (1) PAGE,JESUS (1) VIDAL-RIOJA,LIDIA (1) Mais... Palavra-chave Trivalents (2) Akodon molinae (1) Cornops aquaticum (1) Metaphase I orientation (1) Robertsonian chromosome polymorphism (1) Robertsonian rearrangements (1) Sigmodontinae (1) Synaptonemal complex (1) Mais... Tipo do documento Info:eu-repo/semantics/other (1) Journal article (1) Ano 2009 (1) 2001 (1) País Brazil (1) Chile (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Metaphase I orientation of Robertsonian trivalents in the water-hyacinth grasshopper, Cornops aquaticum (Acrididae, Orthoptera) Genet. Mol. Biol. Colombo,Pablo César. Trivalents resulting from polymorphic Robertsonian rearrangements must have a regular orientation in metaphase I if the polymorphisms are to be maintained. It has been argued that redistribution of proximal and interstitial chiasmata to more distal positions is necessary for a convergent orientation, the only one that produces viable gametes. Cornops aquaticum is a South-American grasshopper that lives and feeds on water-hyacinths, and has three polymorphic Robertsonian rearrangements in its southernmost distribution area in Central Argentina and Uruguay. The orientation of trivalents in metaphase I, the formation of abnormal spermatids and the frequency and position of chiasmata in the trivalents, was analysed in a polymorphic population of C. aquaticus.... Tipo: Info:eu-repo/semantics/other Palavras-chave: Cornops aquaticum; Robertsonian rearrangements; Trivalents; Metaphase I orientation. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100013 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 Registros recuperados: 2 Primeira ... 1 ... Última

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