How did endosymbiosis contribute to the evolution of eukaryotic genomes, and what evidence supports the theory of endosymbiotic origin for organelles like mitochondria and chloroplasts?

Endosymbiosis played a crucial role in the evolution of eukaryotic genomes by enabling the incorporation of entire prokaryotic cells into ancestral eukaryotic cells. This process significantly expanded the genetic repertoire of eukaryotes, allowing for increased metabolic complexity, cellular differentiation, and adaptability. The theory of endosymbiosis, first proposed by Lynn Margulis, explains how organelles such as mitochondria and chloroplasts originated from free-living bacteria that established a symbiotic relationship within a host cell. Over time, these internalized prokaryotes transferred portions of their genetic material to the host genome, leading to a co-evolutionary relationship that shaped modern eukaryotic cells.

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