Key points: 1  DNA cloning is a molecular biology technique that makes many identical copies of a piece of DNA, such as a gene. 2  In a typical cloning experiment, a target gene is inserted into a circular piece of DNA called a plasmid.
1 Some studies of twins and families suggest that personality disorders may be inherited or strongly associated with other mental disorders among family members. 2  Brain abnormalities. 3  Some research has shown changes in certain areas of the brain involved in emotion regulation, impulsivity and aggression.auses. As with other mental disorders, the causes of borderline personality disorder aren't fully understood. In addition to environmental factors â such as a history of child abuse or neglect â borderline personality disorder may be linked to:
Borderline Personality Disorder. Borderline personality disorder is a longstanding pattern of swings -- in moods, relationships, self-image, and behavior. People with borderline personality disorder have very strong emotions and often try to hurt themselves, and may have problems with relationships with people.n this article. Borderline personality and bipolar: These two disorders are often confused. They both have symptoms of impulsiveness and mood swings. But they are different disorders and have different treatments.