The extra X and/or Y chromosome can affect physical, developmental, behavioral, and cognitive functioning. Common physical features may include tall stature, lack of secondary pubertal development, small testes (hypogonadism), delayed pubertal development, and breast development (gynecomastia) in late puberty.
Hope this helps, mark brainliest
Answer: They effect the gender of the baby
Explanation: if the outcome is xx its a girl it itfs xy its a boy
