A breakage study is a useful technique that can detect obvious chromosomal aberrations such as breaks, gaps, large deletions, dicentrics, radial figures, ring chromosomes, acentric fragments, complex rearrangements, endoreduplication and premature sister chromatid separation. This technique is excellent for studies looking into chromosomal instability and breakage due to genetic disorders associated with chromosomal breakage, cells with DNA damage repair defects, and animals or cells exposed to X-rays, radiation, chemotherapy or mutagens.