[islon]

Genetic modifications can't alter human nature. What you'll have is a different species, closely related to humans. You can argue that's just semantics, I can agree to a point but unless you give a proper answer to what does it mean to be human my criticism is still valid.

[ef4]

As long as we're going to argue semantics, a "species" is a set of animals who can reproduce with each other.

Dogs are all still dogs, despite the massive genetic changes we've imposed on the various breeds. They can all still interbreed.

I really don't expect humans to accept genetic modifications that make their offspring reproductively incompatible with the rest of humanity. So speciation seems unlikely.

[chrischen]

There are genetic differences between different human races... not to mention constant mutations.