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Repetitive DNA


DNA sequences that are present in many copies per chromosome set. Repetitive DNA sequences may be closely linked (eg satellite DNA or VNTR loci) or dispersed throughout the genome or parts of the genome (eg alu family).
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repetitive DNA
A stretch of DNA consisting of multiple repeats of a motif. See also satellite, minisatellite and microsatellite DNA.
Related Terms: Deoxyribonucleic acid (DNA) ...
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Repetitive DNA Sequences of varying lengths that occur in multiple copies in the genome; it represents much of the human genome.
Reporter gene See: marker
Resolution Degree of molecular detail on a physical map of DNA, ranging from low to high.
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repetitive DNA
Nucleotide sequences, usually noncoding, that are present in many copies in a eukaryotic genome. The repeated units may be short and arranged tandemly (in series) or long and dispersed in the genome.
replication ...
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repetitive DNA like Alu elements and other so-called "junk" DNA
But not all our "junk" DNA is junk.
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Repetitive DNA: A surprising portion of any genome consists not of genes or structural elements, but of frequently repeated simple sequences. These may be short repeats just a few nt long, like CACACA etc.
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Categories: Repetitive DNA sequences
Microsatellite
This article is about the DNA sequence. See miniaturized satellites for orbiting artificial satellites with a mass of less than 100Kg.
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Kinetically, rDNAs are repetitive DNAs. The multiple copies are maintained probably because the rDNA gene needs voluminous transcription.
rDNA genes are tandemly repeated in eukaryotes.
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Genomes differ in size, in part because they have different proportions of repetitive DNA. For example, the total genome size of the puffer fish is about one-tenth the size of the human genome.
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In DNA profiling the relative lengths of sections of repetitive DNA, such as short tandem repeats and minisatellites, are compared.
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It has a very small genome (130-140
Mbp
), five chromosomes and contains almost no repetitive DNA. Its genome will be completely sequenced by the end of 2000.
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