D-loop replication is a proposed process by which circular DNA molecules like those found in many (though not all) chloroplasts and mitochondria replicate their genetic material. These circular chromosomes often contain D-loops, short regions of triple-stranded DNA where the double-stranded duplex molecule is opened and one of the strands is displaced by a third, independent strand of variable length.
D-loop replication is a proposed process by which circular DNA molecules like those found in many (though not all) chloroplasts and mitochondria replicate their genetic material. These circular chromosomes often contain D-loops, short regions of triple-stranded DNA where the double-stranded duplex molecule is opened and one of the strands is displaced by a third, independent strand of variable length.
Source: Wikipedia "D-loop replication" · CC BY-SA 4.0
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