Culture, particularly in urbanized societies, may likewise pervert human instincts by suppressing natural feral constraints and encouraging abnormal patterns of behavior, leading to similar distortions of normal biological behavior, such as homosexuality and the quest for abnormal erotic experiences, including those associated with inter-subspecific sexual experimentation. The sociobiological significance of prejudice becomes even more apparent when we realize that evolution arises not solely from individual competition. Team spirit and group cohesiveness have a high survival value for those mammals and primates which have adopted a pattern of group life. Furthermore, the concept of the survival of the fittest among social animals such as man refers less to individuals than it does to breeding populations and entire sub-species. Indeed evolution is concerned not with the individual organism but only with breeding populations, with phylogenetic continua.
Evolution involves populations, sub-species and species.
Evolution is in no way concerned with the welfare or well-being of any one individual organism except to the extent that the death or survival of that organism may affect the gene pool of the breeding population. Fitness also must not be misunderstood. Biologically, an individual is little more than a link in the chain of generations. The genetic integrity of the gene pool is therefore of paramount evolutionary importance. Evolution could not continue its work amongst the higher animals if each new experimental sub-species were to lose its identity before it had time to evolve into a new species.