"Formation of a new race takes place when, over several generations, individuals in one group reproduce more frequently among themselves than they do with individuals in other groups"

This quote by J. Philippe Rushton suggests that the development of a new race is an outcome of a procedure of self-segregation over numerous generations. This takes place when individuals within a certain group select to replicate regularly with each other than with individuals from other groups. This procedure of self-segregation can be seen as a kind of natural choice, as it permits the hereditary traits of the group to be given and end up being more popular in time. This can lead to the development of a brand-new race, as the hereditary characteristics of the group end up being more distinct from those of other groups. Eventually, this quote recommends that the formation of a brand-new race is a result of a process of self-segregation over multiple generations.