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Cells are later taken from the new sample and stained. The laboratory specialist uses a microscope to examine the size, shape, and number of chromosomes in the cell sample. The stained sample is photographed to show the arrangement of the chromosomes. This is called a karyotype. Certain problems can be identified through the number or arrangement of the chromosomes.
Most living things have chromosomes, or units of genetic information, in their cells. The number and appearance of chromosomes vary among species. A karyotype is the number, size, and shape of chromosomes in an organism. To determine the karyotype of an organism, scientists must follow these steps: 1  Collect a cell from an individual. 2  Induce the cell to divide. 3  Stop cell division in metaphase when chromosomes are easiest to see. 4  Stain the chromosomes to make them visible. 5  View the cell under a microscope.