Cytogenetics is the study of chromosome and . So what do cytogenetic technologists do? Simply, they analyze . It is possible to treat so that their are under light microscopy. They are in a special way to reveal of light- and dark- staining regions along the length of each . The stripes vary in , yet for a particular they are highly specific. This pattern of stripes helps the chromosomes from each other. Abnormalities of number are easily seen.