X chromosome aneuploidy

X chromosome aneuploidy occurs when there is an abnormal number of X chromosomes in a person's cells, such as having extra (e.g., Klinefelter syndrome with XXY) or missing X chromosomes (e.g., Turner syndrome with X0). This imbalance can affect development and physical features because X chromosomes carry important genes. The severity and symptoms vary depending on the specific type of aneuploidy. These conditions often result from errors during cell division early in development and can influence health, growth, and fertility.