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It all depends on which organism you are talking about and there is no set phase.

In many single-celled eukaryotes, their growth and division is linked to the cell cycle.
In single cell algae. the only chloroplast and then the only mitochondrion divide before the nucleus undergoes mitosis and before cytokinesis.

In other eukaryotes (in mammals for example), mitochondria may replicate their DNA and divide mainly in response to the energy needs of the cell, rather than in phase with the cell cycle. If it does replicate with the cell cycle, it can occur during the S phase of the mitotic cycle and even through out the mitotic cycle.

It all depends on which organism you are talking about and there is no set phase.

In many single-celled eukaryotes, their growth and division is linked to the cell cycle.

In single cell algae. the only chloroplast and then the only mitochondrion divide before the nucleus undergoes mitosis and before cytokinesis.

In other eukaryotes (in mammals for example), mitochondria may replicate their DNA and divide mainly in response to the energy needs of the cell, rather than in phase with the cell cycle. If it does replicate with the cell cycle, it can occur during the S phase of the mitotic cycle and even through out the mitotic cycle.

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10y ago

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