“INHERITED CHIMERISM is an alternative to the problematic practice of conjuring up additional, gene-donating symbionts at organelle origins to explain gene trees. It places no constraints on the collections of genes that the plastid and the mitochondrial symbionts possessed, other than that it needs to be a genome-sized collection, not tens of thousands of genes, and it allows freely for lateral gene transfer among prokaryotes before the endosymbionts become organelles and afterward. Lateral gene transfers among prokaryotes has received much attention in the past decades. Inherited chimerism incorporates lateral gene transfers among prokaryotes into endosymbiotic theory.”
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