These might help. Biological fitness is definitely quantifiable and is a major component of population genetics. http://en.wikipedia.org/wiki/Genetic_purging h

These might help. Biological fitness is definitely quantifiable and is a major component of population genetics. http://en.wikipedia.org/wiki/Genetic_purging http://en.wikipedia.org/wiki/Genetic_purging http://en.wikipedia.org/wiki/Inbreeding_depression http://en.wikipedia.org/wiki/Inbreeding_depression