The presence of an extra chromosome in a persons genetic code is known as a chromosomal condition or trisomy. A person with a trisomy has 47 chromosomes instead of the usual 46. The most common forms of trisomy are Down syndrome, Edward syndrome, and Patau syndrome. However, there are also specific chromosomal conditions that result in 47 chromosomes, such as XYY syndrome and Triple X syndrome.

• XYY Syndrome: This is a rare chromosomal disorder caused by the presence of an extra Y chromosome in each of a males cells. As a result of the extra Y chromosome, each cell has a total of 47 chromosomes instead of the usual 46. It is unclear why an extra copy of the Y chromosome is associated with tall stature, learning problems, and other features in some boys and men.

• Triple X Syndrome: This is a chromosomal condition that results in 47 chromosomes in each cell instead of the usual 46. In triple X syndrome, a female has three X chromosomes. Many girls and women with triple X syndrome dont experience symptoms or have only mild symptoms. In others, symptoms may be more apparent — possibly including developmental delays and learning disabilities. Seizures and kidney problems occur in a small number of girls and women with triple X syndrome.

In general, having 47 chromosomes can result in a range of birth anomalies, including delayed development and intellectual disabilities. The specific effects of having 47 chromosomes can vary depending on the specific chromosomal condition.