Evolution on Human Ethics and Moral codes

Excerpt from "The Blind Watchmaker" - Chapter 11- One true tree of
life - Richard Dawkins

The last common ancestor of humans and chimps lived perhaps as
recently as 5 million years ago, definitely more recelntly than the
comon ancestor of chimps and orang-utans, and perhaps 30 million
years more recently than the common ancestor of chimps and monkeys.
Chimpanzees and we share moere than 99% of our genes. If, in various
forgotten islands around the world, survivors of all intermediated
back to the chimp/human common ancestor were discovered, who can
doubt that our laws and our moral conventions would be profoundly
affected, expecially as there would presumably be some interbreeding
along the spectrum? Either the whole spectrum would have to be
granted full human rights (Votes for Chimps), or there would have to
be an elaborate apartheid-like system of discriminatory laws, with
courts deciding whether particular individuals were legally 'chimps'
or legally 'humans' ; and people would fret about their daughter's
desire to marry one of 'them;. I supose the world is already too well
explored for us to hope that this chastening fantasy will ever come
true. But anybody who thinks that there is something obvious and self-
evident about human 'rights' should reflect that it is sheer luck
that these embarrassing intermediates happen not to have survived.
Alternatively, maybe even if chimps hadn't been discovered until
today they would be seen as the embarrassing intermediates.

Rajan >> The idea being explored is that if we consider some non-
humans with common ancestors as humans, as cousins then why apply a
separate moral code for them.