Jacob's syndrome

All about XYY Syndrome :)

1. JACOB’S SYNDROME Presented by: Yamson, A. J. STEM-11B

2. DESCRIPTION genetic condition that occurs when a male has an extra copy of the Y chromosome in each of their cells

3. Other names: XYY Syndrome XYY Karyotype YY Syndrome

4. FREQUENCY 1 out of every 1000 boys 5 – 10 boys (United States)

5. SYMPTOMS severe acne in adolescence learning disabilities delayed motor skill development emotional and behavioral difficulties

6. hypotonia involuntary muscle movements taller-than-average height larger head dimensions low testosterone levels infertility

7. CAUSE cell-division error in the sperm prior to conception known as “ nondisjunction ”