Satellite DNA
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Satellite DNA consists of highly repetative DNA, and is so-called because repetitive DNA sequences tend to be have a relatively high frequency of the nucleotides Adenine and Thymine, and thus have lower density - such that they form a second 'satellite' band when genomic DNA is separated along a density gradient.
The repeated pattern can be between 1 basepair long (a mononucleotide repeat) several thousand base pairs long, and the total size of a satellite DNA block can several be megabases without interruption.