银额果蝇的B染色体研究:2.昆明群体的生活力和B染色体的关系

The Study of B Chromosomes In Drosophila albomicans 2.The Reiation Between B Chromosomes and The Vitality of Kunming Population

摘要: 本文分析了银额果蝇的生活力和B染色体的关系。结果表明，银额果蝇的B染色体在其生长和发育过程中具双重性调节作用。一方面，B染色体以单一的形式存在于单雌系核型中，即1B或2Bs，可刺激生长、发育，增强生活力。另一方面，在单雌系的细胞中存在多条B染色体并形成核型多态性，这似乎对生长和发育又有一定的抑制作用而减弱其生活力。

Abstract: The relation between B chromosomes and the vitality of Drosophila albomicans were analysed.The results showed that B chromosomes of D.albomicans serves two regulated functions during growth and development proecss.Their characters showed that B chromosomes exist inkaryotype of isofemale line as unitary shape,1B or 2Bs,that stimulate the action of growth and incresase the vitality on the one hand,and multiple B chromosomes exist to form the karyotype polymorphism resulted in restrictive action for growth and development on the other hand.