XYY Syndrome is a genetic condition in which a male has an extra Y chromosome. It is also known as Jacob's Syndrome, after the first reported case in 1961. People with XYY Syndrome typically have normal physical development and normal intelligence, but may have delayed speech and language development, and may be taller than average. They may also have behavioral and learning difficulties.

Common symptoms of XYY Syndrome include:

- Tall stature
- Low muscle tone
- Delayed speech and language development
- Learning disabilities
- Attention deficit hyperactivity disorder (ADHD)
- Behavioral problems
- Poor coordination
- Poor social skills
- Poor academic performance
- Poor fine motor skills
- Poor gross motor skills
- Poor visual-motor integration
- Poor visual-spatial skills
- Poor executive functioning skills
- Anxiety and depression

XYY Syndrome is caused by an extra copy of the Y chromosome in a male's cells. This extra copy of the Y chromosome is not inherited from either parent, but instead occurs as a random event during the formation of the male's reproductive cells.

Treatment for XYY Syndrome is typically focused on managing any associated medical and behavioral issues. This may include medications to help with attention-deficit/hyperactivity disorder (ADHD) or other behavioral issues, speech and language therapy, physical therapy, and occupational therapy. In some cases, surgery may be recommended to correct physical abnormalities.

1. Advanced maternal age: Women over the age of 35 are more likely to have a child with XYY Syndrome.

2. Family history: If a family member has XYY Syndrome, there is an increased risk of having a child with the condition.

3. Chromosomal abnormality: XYY Syndrome is caused by an extra Y chromosome, which can occur randomly or be inherited from a parent.

4. Environmental factors: Exposure to certain environmental toxins or radiation may increase the risk of XYY Syndrome.

There is no cure for XYY Syndrome, but medications may be prescribed to help manage symptoms. These may include medications to help with attention and hyperactivity, as well as medications to help with anxiety and depression. Additionally, behavioral therapy may be recommended to help with social and communication skills.