Sequence Homogeneity of The Repeat Unit
In the large rDNA array, polymorphisms between rDNA repeat units are very low, indicating that rDNA tandem arrays are evolving through concerted evolution. 5S tandem repeat sequences in several Drosophila were compared with each other; the result revealed that insertions and deletions occurred frequently between species and often flanked by conserved sequences. They could occur by slippage of the newly synthesized strand during DNA replication or by gene conversion.
Read more about this topic: Ribosomal DNA
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