From early prokaryotes that lived symbiotically with eukaryotic cells
Margules endosymbiont theory
They have evolved from bacteria. Aerobic bacteria have turned into them
Mitochondria and chloroplasts.
They are originated from bacteria.They have ribosomes,DNA,enzymes etc
Scientists believe that mitochondria originated from ancient bacteria that were engulfed by early eukaryotic cells through a process called endosymbiosis. Over time, the relationship between the host cell and the engulfed bacteria became mutually beneficial, leading to the evolution of mitochondria as specialized organelles responsible for energy production in eukaryotic cells.
Take the mitochondria as example. This organelle contains it's own circular DNA that is representative of cyanobacterial DNA. This DNA codes for some proteins also. Some mitochondrial DNA has been taken into the nuclear DNA where it's presence is rather obvious. And the mitochondria fission in reproducing themselves.
Mitochondria and chloroplasts are two organelles believed to be remnants of unicellular bacteria. Mitochondria are thought to have evolved from aerobic bacteria, while chloroplasts are believed to have originated from photosynthetic bacteria.
Mitochondria are believed to have originated from ancient bacteria that were engulfed by early eukaryotic cells through a process called endosymbiosis. This symbiotic relationship eventually led to the evolution of mitochondria as specialized organelles within eukaryotic cells.
The endosymbiont theory is associated with mitochondria and chloroplasts. It proposes that these organelles originated from primitive prokaryotic cells that were engulfed by ancestral eukaryotic cells and formed a symbiotic relationship.
Mitochondria and chloroplasts have their own DNA. Mitochondria DNA is circular, similar to bacterial DNA, and is inherited maternally. Chloroplasts also have circular DNA and are thought to have originated from endosymbiotic relationships with ancient prokaryotes.
The endosymbiotic theory suggests that mitochondria and chloroplasts evolved from symbiotic relationships between prokaryotic cells. More specifically, mitochondria are proposed to have originated from aerobic bacteria, while chloroplasts are thought to have originated from photosynthetic bacteria.
Both of them are thought to have originated from primitive bacteria. This theory is called Endosymbiont theory.
The energy-producing organelles in cells are called mitochondria. They generate ATP (adenosine triphosphate), which is the energy currency of the cell, through a process called cellular respiration. Mitochondria contain their own DNA and are thought to have originated from symbiotic bacteria.