Psychological research has demonstrated that living in poverty has a wide range of negative effects on the physical and mental health and wellbeing of our nationâs children. Poverty impacts children within their various contexts at home, in school, and in their neighborhoods and communities.
Transformation. Definition. noun, plural: transformations. (1) The act, state or process of changing, such as in form or structure; the conversion from one form to another. (2) (biology) Any change in an organism that alters its general character and mode of life; post-natal biological transformation or metamorphosis. (3) (genetics) The genetic alteration of a bacterial cell resulting from the transfer of foreign DNA.
Population genetics is a field of biology that studies the genetic composition of biological populations, and the changes in genetic composition that result from the operation of various factors, including natural selection.. Population-Genetic Models of Evolution. Population geneticists usually define âevolutionâ as any change in a population's genetic composition over time. The four factors that can bring about such a change are: natural selection, mutation, random genetic drift, and migration into or out of the population.