1. In situ hybridisation of satellite DNA clusters in heterochromatic regions flanking centromeres. 2. In humans, most satellite DNA is of the alphoid family found mainly in cntromeric regions that total up to 3 million base pairs. 3. Base sequences and organizational motifs of satellite DNA are common to many regions within and flanking centromeric DNA. 4. Rapid renaturation of DNA indicates the presence of repetitive sequences. Solution 1. In situ hybridisation of satellite DNA clusters in heterochromatic regions flanking centromeres. 2. In humans, most satellite DNA is of the alphoid family found mainly in cntromeric regions that total up to 3 million base pairs. 3. Base sequences and organizational motifs of satellite DNA are common to many regions within and flanking centromeric DNA. 4. Rapid renaturation of DNA indicates the presence of repetitive sequences..