Abstract
In the origin and maintenance of race and species, isolation is an indispensable factor and its role and importance have been recognized for a long time. Even Lamarck and Darwin pointed out that interbreeding of different populations may result in swampimg of the differences acquired during the process of evolutionary divergence. During the process of speciation the diverging populations must acquire some means of isolation so that the genes from one gene pool are prevented from dispersing freely into foreign gene pool. Reproductive isolating mechanisms prevent exchange of genes between Mendelian populations by genetically conditioned mechanisms which are intrinsic to the organisms themselves. Thus, the origin of reproductive isolating mechanisms is an important event in the process of cladogenesis (speciation).
Drosophila characterized by rich species diversity (over 1500 described species) has been utilized in genetical, behavioral and evolutionary studies since the beginning of the last century as it is very good material for such studies. Different types of reproductive isolating mechanisms have been studied in Drosophila such as gametic isolation, ethological (sexual or behavioral) isolation, hybrid inviability and hybrid sterility. Among these four types of reproductive isolating mechanisms, ethological isolation is widespread in the genus Drosophila. Various techniques have been used by different investigators to test the degree of ethological isolation. In such studies, both types of ethological isolation, interspecific as well as intraspecific have been tested. In intraspecific sexual isolation tests, wild type and mutant strains of the same species have been utilized. The pattern of isolation as well as the degree of isolation has often been used to discuss the phylogenetic relationship among the species and also to elucidate the direction of evolution among closely related species of different species groups. There are different types of stimuli involved in mating behavior of Drosophila which provide basis for ethological isolation. There are interesting cases reported by Indian workers regarding the pattern of ethological isolation and the direction of evolution. Mechanisms of origin of reproductive isolating mechanisms and also the models which have been proposed to predict the direction of evolution based on the mode of mating preference have been discussed while mentioning numerous examples of both kinds of incomplete sexual isolation, intra- and inter-specific. While considering different forms of post-zygotic reproductive isolation, hybrid sterility is the most common form and it is of special interest as its genetic basis may provide information about the mechanism of speciation.
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Singh, B.N. (2010). The origin of reproductive isolating mechanisms is an important event in the process of speciation: Evidences from Drosophila . In: Sharma, V.P. (eds) Nature at Work: Ongoing Saga of Evolution. Springer, New Delhi. https://doi.org/10.1007/978-81-8489-992-4_11
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