Heredity and environment

INTRODUCTION. Heredity is the totality of characteristics transmitted from the parents to the offspring. The transmission of genetic characteristics is a function of the CHROMOSOMES and GENES (q.q.v.). The exact mechanism of hereditary transmission was not known until the discovery of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). It is now believed that the molecules […]


Depression is, in the normal individual, a state of despondency characterized by feelings of inadequacy, lowered activity, and pessimism about the future. In pathological cases, it is an extreme state of unresponsiveness to stimuli, together with self-depreciation, delusions of inadequacy, and hopelessness. According to Coleman, “Most of us are prone to repeated cycles in and […]