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 a scientist who specializes in heredity, in particular the mechanism of hereditary transmission. If you are fascinated by science and technology and eager to contribute to the field that will likely have the most influence on 21st century science and medicine, consider studying to become a geneticist.