A cytogenetic map is the visual appearance
of a chromosome when stained and examined under a microscope.
Particularly important are visually distinct regions, called
light and dark bands, which give each of the chromosomes a unique
appearance. This feature allows a person's chromosomes to be
studied in a clinical test known as a karyotype, which allows
scientists to look for chromosomal alterations.
Source: definition from the National Human Genome Research Institute (NHGRI)
Glossary of Genetic Terms.
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