Monogenism or sometimes monogenesis is the theory of human origins which posits a common descent for all human races. The negation of monogenism is polygenism. This issue was hotly debated in the Western world in the nineteenth century, as the assumptions of scientific racism came under scrutiny both from religious groups and in the light of developments in the life sciences and human science. It was integral to the early conceptions of ethnology.
Modern scientific views favor this theory, with the most widely accepted model for human origins being the "Out of Africa" theory.
The belief that all humans are descended from Adam is central to traditional Judaism, Christianity and Islam. Christian monogenism played an important role in the development of an African-American literature on race, linked to theology rather than science, up to the time of Martin Delany and his Principia of Ethnology (1879). Scriptural ethnology is a term applied to debate and research on the biblical accounts, both of the early patriarchs and migration after Noah's Flood, to explain the diverse peoples of the world. Monogenism as a Bible-based theory required both the completeness of the narratives and the fullness of their power of explanation. These time-honored debates were sharpened by the rise of polygenist skeptical claims; when Louis Agassiz set out his polygenist views in 1847, they were opposed on biblical grounds by John Bachman, and by Thomas Smyth in his Unity of the Human Races. The debates also saw the participation of Delany, and George Washington Williams defended monogenesis as the starting point of his pioneer history of African-Americans.
Adam in rabbinic literature and Islamic views on Adam
Environmentalist monogenism describes a theory current in the first half of the nineteenth century, in particular, according to which there was a single human origin, but that subsequent migration of groups of humans had subjected them to different environmental conditions.
Environmentalism in this sense was found in the writings of Samuel Stanhope Smith.
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Le polygénisme était une théorie qui prétendait que l'humanité était en fait divisée en espèces ou en races d'origines différentes. Il s'opposait au monogénisme, théorie défendue notamment par l'Église catholique et selon laquelle un seul couple est à l'origine de l'espèce humaine (voire notamment Adam et Ève). Attention à certains risques de confusion sémantique : on qualifie aussi de polygénique une maladie ou un état particulier impliquant plusieurs gènes. Le polygénisme est annoncé dès le par la théorie préadamite d'Isaac La Peyrère.
The Anthropological Society of London (ASL) was a short-lived organisation of the 1860s whose founders aimed to furnish scientific evidence for white supremacy which they construed in terms of polygenism. It was founded in 1863 by Richard Francis Burton and James Hunt. Hunt had previously been the secretary of the Ethnological Society of London, which was founded in 1843. When he founded the breakaway ASL, Hunt claimed that society had "the object of promoting the study of Anthropology in a strictly scientific manner".
La notion de race humaine, par analogie avec les races d'animaux d'élevage, est employée pour établir des classifications internes à l'espèce humaine selon des critères morphologiques ou culturels. Des études scientifiques, fondées depuis le milieu du sur la génétique, ont montré que le concept de « race » n'est pas pertinent pour caractériser les différents sous-groupes géographiques de l'espèce humaine car la diversité génétique est beaucoup plus importante entre les individus d'une même population qu'entre groupes différents.