Which of the following is not an adult-onset genetic disorder?

Jacob's voice starts to change and he then experiences the beginning of pubic hair growth. This sequence of pubertal events is:

A) unusual. B) typical. C) more common in African American boys than Caucasian boys. D) an indication of a hormonal imbalance.

Concordance rates from twin studies are higher for medical disorders than psychological disorders

Indicate whether the statement is true or false