Drosophila ananassae: a species characterized by spontaneous male recombination in appreciable frequency

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dc.contributor.authorSingh, Bashisth N.en_US
dc.date.accessioned2020-11-18T10:21:10Z
dc.date.available2020-11-18T10:21:10Z
dc.date.issued2020-01
dc.description.abstractMutation and recombination are primarily responsible for generating the genetic variability in natural populations of microorganisms, plant and animal species including humans. Upon such genetic variations, elemental forces of evolution such as natural selection, random genetic drift and migration operate to bring about micro-evolutionary changes. Recombination or crossing-over produces new combinations of genes due to interchange of corresponding segments between nonsister chromatids of homologous chromosomes, thus, it is an important evolutionary factor. Since the time of T. H. Morgan, Drosophila has been subjected to extensive investigations on crossing over while employing a number of markers, which were used for gene mapping. Interestingly, recombination occurs in females of D. melanogaster but not in males. Later on, male crossing over was investigated in various species and its occurrence was reported in D. melanogaster, D. ananassae, D. simulans, D. willistoni, D. littoralis and D. bipectinata. Recombination occurs at very low rate in all these species except for D. ananassae, which shows spontaneous male crossing over in appreciable frequency, which is meiotic in origin. This unusual phenomenon in D. ananassae is influenced by various genetic factors as well as it shows strain variation as far as frequency of male recombination is concerned. Further, the presence of chiasmata during meiosis in males at a frequency capable of accounting for the observed recombination frequency extends evidence for meiotic origin of recombination in males of D. ananassae.en_US
dc.identifier.affiliationsGenetics Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi 221 005, Indiaen_US
dc.identifier.citationSingh Bashisth N.. Drosophila ananassae: a species characterized by spontaneous male recombination in appreciable frequency. Journal of Genetics. 2020 Jan; 99: 1-7en_US
dc.identifier.issn0022-1333
dc.identifier.issn0973-7731
dc.identifier.placeIndiaen_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/215552
dc.languageenen_US
dc.publisherIndian Academy of Sciencesen_US
dc.relation.volume99en_US
dc.source.urihttps://doi.org/10.1007/s12041-019-1169-zen_US
dc.subjectspontaneous male recombinationen_US
dc.subjectgenetic peculiarityen_US
dc.subjectmeiotic in originen_US
dc.subjectgenetic factorsen_US
dc.subjectpresence of chiasmataen_US
dc.subjectDrosophila ananassae.en_US
dc.titleDrosophila ananassae: a species characterized by spontaneous male recombination in appreciable frequencyen_US
dc.typeJournal Articleen_US
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