![]() The karyotype can help identify abnormalities in the structure or the number of chromosomes. A picture, or chromosome map, of all 46 chromosomes is called a karyotype. Once stained, the chromosomes look like strings with light and dark "bands," and their picture can be taken. ![]() In order for chromosomes to be seen this way, they need to be stained. For a century, scientists studied chromosomes by looking at them under a microscope.
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