Here are some websites that deal with the concept of genetic drift; however, I believe the last link might fit your context the best.
Hope this helps!


http://www.bioweb.uncc.edu/faculty/leamy/popgen/driftsex.htm

Genetic Drift
Genetic Drift Genetic drift is a process of pure chance by which gene frequencies
can change with no external stimuli. This idea might seem to contradict the ...
library.thinkquest.org/19926/text/tour/09.htm - 9k
Synthetic Theory of Evolution: Small Population Effects
... are due solely to chance factors. The smaller the population, the more susceptible
it is to such random changes. This phenomenon is known as genetic drift. ...
anthro.palomar.edu/synthetic/synth_5.htm - 10k

Gregory Stock, Director of UCLA’s Program on Medicine, Technology and Society:
"Once people begin to reshape themselves through biological manipulation, the definition of human begins to drift.... Altering even a small number of the key genes regulating human growth might change human beings into something quite different....But asking whether such changes are ‘wise’ or ‘desirable’ misses the essential point that they are largely not a matter of choice; they are the unavoidable product of...technological advance..."
http://members.tripod.com/~ngin/gmhuman.htm