Data/hora: 02/06/2024 02:09:11

Provedor de dados: 	74	
País: 	Brazil	
Título: 	Chromosome polymorphisms in natural populations of the South American grasshopper Sinipta dalmani	
Autores: 	Remis,Maria Isabel.	
Data: 	2008-01-01	
Ano: 	2008	
Palavras-chave: 	Pericentric inversion; Centric fusion; Chiasma conditions; Grasshopper.	
Resumo: 	Six populations of Sinipta dalmani from the provinces of Buenos Aires and Entre Rios (Argentina) were analyzed. The populations of "El Palmar" National Park (Entre Rios) were polymorphic for pericentric inversions in pairs M4 and M7 and for a centric fusion involving pair M5 and the X chromosome. The M4 inversion remained similar over time and the karyomorphic frequencies did not depart from those expected according to the Hardy-Weinberg equilibrium. The analysis of chiasma frequency and distribution showed clear intra- and interchromosome effects of the different chromosome rearrangements. Both inversions and centric fusions were related with total or partial crossing over restriction in heterozygous condition, leading to a genetic differentiation between rearranged and non-rearranged chromosomes. The chromosome polymorphisms analyzed herein were associated with an increase in the number of terminal chiasmata both in the rearranged chromosomes (heterozygous centric fusion and homozygous M4 inversion) and in the other chromosomes (M4 inversion). Our results showed that the chromosome polymorphisms in S. dalmani may be associated with a significant decrease in genetic recombination, which may explain in part their maintenance in some areas of its geographical distribution.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000100009	
Editor: 	Sociedade Brasileira de Genética	
Relação: 	10.1590/S1415-47572008000100009	
Formato: 	text/html	
Fonte: 	Genetics and Molecular Biology  v.31 n.1 2008	
Fonte: 	info:eu-repo/semantics/openAccess