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In an essay written for the same conference, Lee Silver describes "Type I"

genetic changes—"those that will provide the embryo with a gene that
other people get naturally"—and "Type II" enhancements, "those that have
not appeared previously within the human population."

Silver continues: "The use of genetic enhancement could greatly increase
the gap between `have's' and `have-not's' in the world. The gap may
emerge initially between classes within a society. But, if the cost of
reprogenetic technology follows the downward path taken by other advanced
technologies like computers and electronics, it could become affordable
to the majority members of the middle class in Western societies.
Ultimately, Type II genetic enhancements—which provide new non-human
genes to children—will become feasible, and with Type II enhancements,
there really are no limitations to what is possible.

"When this happens, the social advantage that wealthy societies currently
maintain could be converted into a genetic advantage. And the already
wide gap between wealthy and poor nations could widen further and further
with each generation until all common heritage is gone. A severed
humanity could very well...