This is taken from "Skeletal DNA and the Evolution of
Genome Size," T. Cavalier-Smith, 1982, Ann. Rev. Biophys.
Bioeng. 11: 273-302.
"The mass of DNA in a haploid nucleus is usually constant
in any one species and is known as its C-value or genome
size... Particularly puzzling has been the almost 10^5-fold
variation in C-value among different eukaryote species. Often
dubbed the C-value paradox, it appears inexplicable in terms
of qualitative differences between organisms."
Hope this helps.
Human Genome Center
Lawrence Livermore National Laboratory