This isn’t high school level biology. I teach grades 4-9 science (including high school biology). I actually taught this very concept to my 4th grade class this morning. They’re a very smart group, so I went there with it. I normally teach that in 5th grade, and 99% of them understand it pretty well. I start it with “if you dye your hair blonde, your kids won’t have blond hair because of it. If you get a nose-job, your kids won’t be born with that nose.” Then I progress to “if you do steroids and get as big as the Hulk, your kids won’t be mini-Hulks” and “if you start training for marathons, your kids won’t be born long distance runners.”
They get it.