Chloroplasts contain their own DNA,but the genes on these chromosomes only encode about 10% of the proteins required for photosynthesis.This is evidence for

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The fact that chloroplasts contain their own DNA, but only encode about 10% of the proteins required for photosynthesis, is evidence for endosymbiosis - the idea that chloroplasts were once free-living bacteria that were engulfed by larger eukaryotic cells and eventually evolved into the current symbiotic relationship. The remaining 90% of the proteins required for photosynthesis are encoded by the host cell's nuclear DNA, further supporting the endosymbiotic theory.

Chloroplasts Contain Their Own DNA,but the Genes on These Chromosomes