XYY-三體

Key facts

Other names

47,XYY

Specialty

Medical genetics

Symptoms

None, being taller than the parents, mildly unusual physical features, severe acne , poor coordination , weak muscle tone , learning and speech problems

Usual onset

At conception

Duration

Lifelong

Causes

Two Y chromosomes in males

Diagnostic method

Genetic testing

Differential diagnosis

Klinefelter syndrome , Marfan syndrome , Sotos syndrome

Prevention

None

Treatment

Speech therapy , tutoring

Prognosis

Normal life expectancy

Frequency

~1 in 1,000 males