They have management bucks because they haven't shot those genes out but they are working toward it as best they can.

It doesn't mater if it is inherited 50/50 or some other ratio. I'm not saying how big of an impact you will have...I am just saying that you will have an impact.

How did we breed hogs to be fatter when we didn't know the swine genome. We bred fat hogs to fat hogs. Maybe some of the fat hogs were fat because of better feed instead of genetics but over time the genetics still change. Later leaner hogs were more desirable and the trend went back the other way.

By killing deer with a certain heritable trait, you aren't eradicating the trait, you are reducing it's incidence.