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The repeated sequences in oats DNA have been used to study chromosomal repeated sequence organisation in wheat. Approximately 75% of the wheat genome consists of repeated sequences but only approximately 20% will form heteroduplexes with repeated sequences from oats DNA at 60 degrees C in 0.18 M Na+. The proportion of wheat DNA that forms heteroduplexes with oats DNA is shown to be independent of the wheat DNA fragment length. However, the proportion of wheat DNA that is retained with the heteroduplexes when fractionated on hydroxyapatite is very dependent upon the wheat fragment length up to 3500 nucleotides. This is because more non-renatured wheat DNA is attached to the heteroduplexes with longer fragments. The results indicate that the repeated sequences in the wheat genome homologous to repeated sequences in oats are not clustered in the chromosomes but distributed amongst other repeated and possible non-repeated sequences.
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