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 […]


In psychology, the doctrine that all human actions could, if full knowledge were available, be analyzed into stimulus and response. Stimulus is something that stimulates, meaning thereby, that excites, rouses, or quickens thought or feeling. Behaviorism, a theoretical point of view that holds that the subject matter of psychology is behavior without reference to consciousness […]