monogenesis

Development from a single source, such as a cell, an ancestor, or a language.

Origination or derivation from a single species, or, in a restricted sense, from a single pair. Contrasted with polygenesis (which see).

In biology:

Development of the ovum from a parent similar to itself: opposed to metagenesis.

Generation of an individual from one parent which develops both male and female products, or ova and spermatozoa.

Descent of all living things from a single cell.

Oneness of origin; esp. (Biol.), development of all beings in the universe from a single cell; — opposed to polygenesis. Called also monism.

That form of reproduction which requires but one parent, as in reproduction by fission or in the formation of buds, etc., which drop off and form new individuals; asexual reproduction.

The direct development of an embryo, without metamorphosis, into an organism similar to the parent organism; — opposed to metagenesis.

The theory that mankind originated with a single ancestor or ancestral couple.