Karyotypes are used to analyze chromosomes and diagnose genetic disorders. A karyotype is created by staining, photographing, and arranging chromosomes from largest to smallest based on length, centromere placement, and banding patterns. It can determine gender by identifying sex chromosomes - two X chromosomes indicates a female and one X and one Y chromosome indicates a male. Abnormal karyotypes may indicate chromosomal disorders caused by having an unusual number of chromosomes or structural abnormalities, and can help diagnose conditions. Genetic counselors use karyotype analysis to learn about a person's genetic makeup and identify any potential health risks.