George Robert Price was an American population geneticist. Price is often noted for his formulation of the Price equation in 1967.
George R. Price
Population genetics is a subfield of genetics that deals with genetic differences within and among populations, and is a part of evolutionary biology. Studies in this branch of biology examine such phenomena as adaptation, speciation, and population structure.
The typical white-bodied form of the peppered moth
Industrial melanism: the black-bodied form of the peppered moth appeared in polluted areas.
Drosophila melanogaster
The Great Wall of China is an obstacle to gene flow of some terrestrial species.