有瓣类二蝇种(Diptera:Sarco-phagidae and Calliphoridae)的细胞遗传学特征

研究了两个有瓣蝇种的细胞遗传学特征。结果表明:棕尾别麻蝇核型为2n=12,8M+2SM+2m,XX/XY,性染色体为微小的点状;C带主要分布于常染色体的着丝粒和次缢痕,性染色体Y普遍深染而X淡染;G带数(2n)为88条。铜绿蝇核型为2n=12,12M,XX/XY;常染色体以中央型C带为主,性染色体呈不同程度的深染;G带数(2n)为107条(雄)或110条(雌)。两蝇种染色体均存在多个随体,C带带型呈分散、杂合、多态或不稳定性。结合有关资料,探讨了有瓣蝇类演化的细胞遗传学机制。

CYTOGENETIC STUDIES OF TWO CALYPTRATE DIPTERANS(Sarcophagidae and Calliphoridae: Diptera)

This paper involved cytogenetics of two calyptrate dipterans. Of the first spe-cies, Boettcherisca peregrina, the karyotype was 2n=12, 8M+2SM+2m, XX/XY,sex chromosomes minute point (m); C-bands located mainly on the centromeres andsecondary constrictions of the autosomes, deep staining Y but light in X chromo-somes; G-banding number (2n) was 88. In the secend species, Lucilia cuprina, thekaryotype was 2n=12, 12M, XX/XY; C-banding mainly pericentric in all autosomesand variously deep stained for the X and Y chromosomes, G-banding number (2n)was 107(male) or 110(female). Both species had several satellites in some chromo-somes, and generally, their C-banding patterns were apparently scattering, hetero-zygositic, polymorphic or erretic, esp. in Lucilia cuprina. The cytogentic mechanismfor the evolution of calyptrate diptera was discussed.