In one kind of abnormal chromosome inheritance called down syndrome, a child has three copies of
a. chromosome 23.
b. chromosome y.
c. chromosome 21.
d. chromosome x.

What are the choices given ?

Personality is a mixture of characteristics/qualities that form an individual's distinctive persona. it can be influenced by environmental and biological factors; one's culture is a most important factor that shape personality. extreme mood swings, unstable relationships, distorted self-image, impulsive/risky behavior, explosive anger, chronic feelings of sadness/emptiness, etc. these could indicate that someone could have a personality disorder.