The endosymbiosis that formed mitochondria likely occurred after eukaryotes developed photosynthetic capabilities.

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The endosymbiosis that formed mitochondria occurred before photosynthetic capabilities evolved in eukaryotes. This is supported by the fact that mitochondria are found in all eukaryotes, including non-photosynthetic ones, while plastids (the organelles involved in photosynthesis) are only found in some eukaryotes that have acquired them through secondary endosymbiosis.

The Endosymbiosis That Formed Mitochondria Likely Occurred After Eukaryotes Developed