What is monogenesis theory?

Monogenesis theory, in the context of human evolution and linguistics, posits that all humans and human languages originate from a single common source. In human evolution, this theory suggests that modern humans evolved from a single population, likely in Africa, and then dispersed to other parts of the world. In linguistics, monogenesis proposes that all human languages trace back to a single ancestral language. This theory implies a shared origin and interconnected development of human species and languages, contrasting with the polygenesis theory, which suggests independent origins and evolution in multiple locations.