Not quite. The results of genetic evolution up to this point have produced ^tons of morally relevant changes. All of them, in fact. All those instincts and pulsions and capacities, all those different types of brains, all the biological current state of humanity. The input of evolution hasn't changed much, but the output of the human kind has gone off the scales. So we are still influenced by evolution in that we're the result of it. And we will always be, even if we halt it forever and become immortal or upload into machines or whatever.
The input of evolution changed dramatically about when humans invented agriculture. The increase in quantity and reliability of food supply mean that biological selection pressures became much, much less powerful.
For a more recent example, consider the hemophiliac monarchs of the early 1900s. Hemophilia is genetic and does not enhance reproductive fitness. But the shear wealth of the monarchs (compared to nomadic pre-agriculture humans), meant that there wasn't a limit on the ability of those monarchs to reproduce. Hence, no selection pressure.
I'm sayi...
I have found this most wonderful (if fairly lengthy) article, and thought you would enjoy having it brought to your attention.
It is so good, I think we should include it among the references in the "Politics is the Mind Killer" wiki page. But, before that, I submit it to you, and ask you: is there anything in this article that would warrant its exclusion from this site? I mean, besides the fact that it is about politics, and written by a notorious Social-democrat (And is that in itself grounds for exclusion?).