List 3 main factos responsible for speciation and describe each one of them
Speciation is the process in which one or more species arise from previously existing species. A single species may give rise to a new species or two different species may give rise to a new species. Geographical barrier, natural selection and genetic drift are the main factors causing speciation.
Geographical barrier : Extrinsic geographical barriers such as rivers, mountains, etc between two populations which allows no gene flow and leave them to become new two species.
Genetic drift: Accidental change in allele frequencies that may result in extinction of poulation or formation of new species from them
Natural selection: Selection performed by nature, of the best suited varieties ( having favourable variations)to survive and destruction of the less suited varieties through exposure to environmental stresses.
Geographical barrier : Extrinsic geographical barriers such as rivers, mountains, etc between two populations which allows no gene flow and leave them to become new two species.
Genetic drift: Accidental change in allele frequencies that may result in extinction of poulation or formation of new species from them
Natural selection: Selection performed by nature, of the best suited varieties ( having favourable variations)to survive and destruction of the less suited varieties through exposure to environmental stresses.