TAILIEUCHUNG - Báo cáo sinh học: " Macrogeographic patterns in B-chromosome and inversion polymorphisms of the grasshopper"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Macrogeographic patterns in B-chromosome and inversion polymorphisms of the grasshopper | 2 8 AOUT 1995 Genet Sei Evol 1995 27 305-311 . __ 305 oepane -CHi cc Géí c .- T . s Elsevier INRA BIBUOTI-lèÕtÌí 78352 JOUV f . . Original article Macrogeographic patterns in B-chromosome and inversion polymorphisms of the grasshopper Trimerotropis pallidipennis VA Confalonieri Universidad de Buenos Aires Facultad de Ciencias Exactas y Naturales Departamento de Ciencias Biológicas Intendente Guiraldez y Costanera Norte 1428 Buenos Aires Argentina Received 10 June 1994 accepted 16 February 1995 Summary - South American populations of Trimerotropis pallidipennis are polymorphic for pericentric inversions and B-chromosomes. Previous studies revealed the existence of altitudinal latitudinal and longitudinal clines for 9 chromosomal sequences whose repetition in independent groups of populations and over a wide area suggested the action of natural selection. The frequencies of B-chromosomes were analyzed in 25 samples from Argentina. In some of them the B-chromosome interfers with the genetic control of chiasma formation which is partly conditioned by inversions. Multiple regression analyses revealed that the frequency of B-carriers in each population is significantly associated with latitude negatively and longitude positively and that the frequency of inversions significantly decreases at higher altitudes and latitudes. The pattern of distribution observed for B-carriers is most probably related to the suitability of habitats. These results agree with the parasitic model which claims that higher incidence of the B-chromosome in natural populations is associated with more favorable environments. Orthoptera polymorphism B-chromosome natural selection inversion Résumé - Repartition macrogéographique des polymorphismes du chromosome B et d inversion chez la sauterelle Trimerotropis pallidipennis. Les populations sud-américaines de Trimerotropis pallidipennis sont polymorphes pour des inversions péri-centriques et les chromosomes B. Les études antérieures ont .

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