The genes in chloroplasts more closely match the genes found in cyanobacteria compared to the genes found in the nuclei of photosynthetic eukaryotes.

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This is due to the endosymbiotic theory, which suggests that chloroplasts were originally free-living cyanobacteria that were engulfed by a host cell and developed a symbiotic relationship. As a result, the chloroplasts retained many of the genes found in their cyanobacterial ancestors.

The Genes in Chloroplasts More Closely Match the Genes Found