Hybridization, transgressive segregation and evolution of new genetic systems in Drosophila.

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dc.contributor.authorRanganath, H Aen_US
dc.contributor.authorAruna, Sen_US
dc.date.accessioned2003-12-11en_US
dc.date.accessioned2009-06-02T07:20:52Z
dc.date.available2003-12-11en_US
dc.date.available2009-06-02T07:20:52Z
dc.date.issued2003-12-11en_US
dc.description.abstractIntrogressive 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 pair of allopatric, morphologically almost identical, cross-fertile members of the nasuta subgroup of the immigrans species group-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.en_US
dc.description.affiliationDrosophila Stock Centre, Department of Studies in Zoology, University of Mysore, Manasagangotri, Mysore 570 006, India. drosrang@sancharnet.inen_US
dc.identifier.citationRanganath HA, Aruna S. Hybridization, transgressive segregation and evolution of new genetic systems in Drosophila. Journal of Genetics. 2003 Dec; 82(3): 163-77en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/114390
dc.language.isoengen_US
dc.source.urihttps://www.ias.ac.in/jgenet/index.htmlen_US
dc.subject.meshAnimalsen_US
dc.subject.meshDrosophila --geneticsen_US
dc.subject.meshEvolutionen_US
dc.subject.meshFemaleen_US
dc.subject.meshHybridization, Geneticen_US
dc.subject.meshKaryotypingen_US
dc.subject.meshMaleen_US
dc.titleHybridization, transgressive segregation and evolution of new genetic systems in Drosophila.en_US
dc.typeJournal Articleen_US
dc.typeResearch Support, Non-U.S. Gov'ten_US
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