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首页> 外文期刊>Journal of genetics >Hybridization, transgressive segregation and evolution of new genetic systems in Drosophila
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Hybridization, transgressive segregation and evolution of new genetic systems in Drosophila

机译：果蝇中新遗传系统的杂交，越境分离和进化

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Introgressive hybridization facilitates incorporation of genes from one species into the gene pool of another. Studies on long-term effects of introgressive hybridization in animal systems are sparse. Drosophila nasuta ($2n = 8$) and D. albomicans ($2n = 6$)a€”a pair of allopatric, morphologically almost identical, cross-fertile members of the nasuta subgroup of the immigrans species groupa€”constitute an excellent system to analyse the impact of hybridization followed by transgressive segregation of parental characters in the hybrid progeny. Hybrid populations of D. nasuta and D. albomicans maintained for over 500 generations in the laboratory constitute new recombinant hybrid genomes, here termed cytoraces. The impact of hybridization, followed by introgression and transgressive segregation, on chromosomal constitution and karyotypes, some fitness parameters, isozymes, components of mating behaviour and mating preference reveals a complex pattern of interracial divergence among parental species and cytoraces. This assemblage of characters in different combinations in a laboratory hybrid zone allows us to study the emergence of new genetic systems. Here, we summarize results from our ongoing studies comparing these hybrid cytoraces with the parental species, and discuss the implications of these findings for our understanding of the evolution of new genetic systems.
机译：渐渗杂交有助于将一个物种的基因整合到另一个物种的基因库中。渐进杂交在动物系统中的长期影响的研究很少。 Drosophila nasuta（$ 2n = 8 $）和D. albomicans（$ 2n = 6 $）a“”一对异源，形态几乎相同的，属于移民类物种的nasuta亚组的交叉受精成员，“系统分析杂交的影响，然后在杂交后代中进行亲本特征的海生分离。在实验室中维持超过500代的纳氏假单胞菌和白僵菌的杂种种群构成了新的重组杂种基因组，此处称为细胞种族。杂交，随后的渗入和侵害性分离对染色体组成和核型，某些适应性参数，同工酶，交配行为的组成和交配偏好的影响揭示了亲本物种和细胞种族之间的种族差异的复杂模式。在实验室杂交区中不同组​​合的字符集合使我们能够研究新遗传系统的出现。在这里，我们总结了正在进行的研究结果，将这些杂种与亲代物种进行了比较，并讨论了这些发现对我们对新遗传系统进化的理解的意义。

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