According to large-scale studies done on subjects aged 16 to the 80s in the united states and great britain, one personality trait disappears or is much less apparent in later life. which is it?

NEUROTICISM.

Explanation:

The traits which disappear in the later life is NEUROTICISM.

Neuroticism is one of the Big five traits of human personality.

A person who has more Neuroticism in them this means that the person is moody means he is more likely to experience feeling such as Depression, anger, Anxiety, Lonely, etc.

A person who has high neuroticism have more chance to suffer from a mental disorder.

When age increases the traits of neuroticism decreases.

answer; the smaller of the two reciprocal products of translocated chromosomes is lost; after several cell divisions, only the larger of the two translocated chromosomes remains,its reciprocal is lost;

answer; the changing age structure of the population;