A theory of eukaryotic cells and nuclear origin is based on endosymbioses,where an archaeal cell is thought to have engulfed a bacterium,which then donated genes that would eventually become the nuclear genome of an ancestral eukaryote.

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This is the endosymbiotic theory of eukaryotic cells and nuclear origin, which proposes that ancestral eukaryotes originated from the fusion of an archaeal cell and a bacterium, with the bacterium eventually donating genes that became the nucleus of the eukaryotic cell.

A Theory of Eukaryotic Cells and Nuclear Origin Is Based