Sickle cell anemia is found in Africans. It is thought to have evolved to help prevent malaria mortality.
There are so many . . . I can think of bipolar disorder, depression, disassociation disorder, panic disorder, personality disorder, asocial disorder among the many.
When the results of a test are anomalous the procedure is usually repeated.Sleep walking is an anomalous behavior who's causes are not well understood
One common mental disorder among teenagers is anxiety disorders, such as generalized anxiety disorder or social anxiety disorder. Other commonly seen disorders include depression and attention-deficit/hyperactivity disorder (ADHD). It is important to seek professional help if any of these conditions are suspected in a teenager.
Northern Blacks.
depression
"Blacks in the north", "Freedom at last", "Not your slave", "Life of a free black", "Free blacks among the whites", "Being a free black during a time of slavery".
Southerners realized that blacks were a potent political force and that they would have to share power politically. It heightened fears of Southerners that blacks might gain political power.
Phenylketonuria
depression
ED among others.
Psychopathy, Antisocial Personality Disorder, Asocial Personality Disorder, Narcissistic Personality Disorder and Borderline Personality Disorder are probably the closest. Some sources do not differentiate among some of these and sociopathy.
Spiritual