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Robertsonian chromosome polymorphism of Akodon molinae (Rodentia: Sigmodontinae): analysis of trivalents in meiotic prophase
Provedor de dados: Revista Chilena de Historia Natural
Autores: 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