|
|
The role of hybridization in animal evolution
Šárová, Markéta ; Reifová, Radka (advisor) ; Černá Bolfíková, Barbora (referee)
There is a growing number of studies showing that interspecific hybridization and gene introgression have a creative role in the evolution of animals. These studies emphasize that hybridization and a gene introgression represent an important source of a genetic variability. Within the process of adaptive introgression, adaptive traits may spread among species and help them to colonize new environments. Interspecific hybridization may also contribute to the emergence of new phenotypes and evolutionary novelties and thus contribute to adaptive radiations. Hybridization can be also a cause of parallel evolutions in many organisms. Another way how hybridization affects evolution is related to a speciation. Hybrid speciation could be one of ways how new species arise, and in this way increase the biodiversity. However in many cases the hybridization has an opposite impact on species richness and present a danger of species extinction by hybridization. The aim of this bachelor thesis is to explain and discuss the above described processes, introduces selected examples of animals related to these processes, and finally evaluate the role of interspecies hybridization in animal evolution. Key words: interspecific hybridization, adaptive introgression, adaptive radiation, parallel evolution, hybrid speciation
|
guest ::
