Mitochondria and chloroplasts display similarities with bacteria that led to the endosymbiont theory.
This theory states that an early ancestor of eukaryotic cells engulfed an oxygen-using nonphotosynthetic prokaryotic cell. Eventually, the engulfed cell formed a relationship with the host cell in which it was enclosed, becoming an endosymbiont (a cell living within another cell).
Indeed, over the course of evolution, the host cell and its endosymbiont merged into a single organism, a eukaryotic cell with a mitochondrion. At least one of these cells may have then taken up a photosynthetic prokaryote, becoming the ancestor of eukaryotic cells that contain chloroplasts. This theory is consistent with many structural features of mitochondria and chloroplasts.
First, rather than being bounded by a single membrane like organelles of the endomembrane system, mitochondria and typical chloroplasts have two membranes surrounding them.
There is evidence that the ancestral engulfed prokaryotes had two outer membranes, which became the double membranes of mitochondria and chloroplasts.
Second, like prokaryotes, mitochondria and chloroplasts contain ribosomes, as well as multiple circular DNA molecules associated with their inner membranes. The DNA in these organelles programs the synthesis of some organelle proteins on ribosomes that have been synthesized and assembled there as well. Third, also consistent with their probable evolutionary origins as cells, mitochondria and chloroplasts are autonomous (somewhat independent) organelles that grow and reproduce within the cell.
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The Endosymbiotic Theory | Evolution of mitochondria and chloroplast | Video 13
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Explained very well❣️
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may God protect u from every evils
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prokaryotic cell me nucleus kese bana in
endosymbiotic theory me nucleus kese bana sir
????
Sooooo good
JazakAllah sir
Sir or bad likhye ga
sir eukaryote prokaryotes sa evolute ho wa han
early cell prokaryotes tha eukaryote nhi
prokaryotes na engulf kia bacteria ko
Thanks alots ❤