Definition of knell. 1  transitive verb. : 2  to summon or announce by or as if by a knell. 3  intransitive verb. 4  1 : to ring especially for a death, funeral, or disaster : toll. 5  2 : to sound in an ominous manner or with an ominous effect.
For the journal, see Demography (journal) . Demography is the statistical study of populations, including of human beings. As a very general science, it can analyze any kind of dynamic living population, i.e., one that changes over time or space (see population dynamics).
A geneticist is someone who studies and works to apply his or her knowledge of genetics, a branch of biological sciences that involves heredity and natural variation in living organisms. These scientists primarily focus on the passage of traits from parents to offspring through generations, though this is far from the only area of interest.