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mitochondria are thought to originate from symbiotic prokaryote. And they reside outside the nucleus. During fusion of sperm and egg, only the egg provides the mitochondria of the future fetus.

During growth of the organism, mitochondria replicate like bacteria at each division/duplication of cell. Thus each cell of the grown individual has exactly the same mitochondrial genes that the fetus, that is, the mitochondrial genes of the egg of the mother.

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