From GameWatcher: “Fallout 76 has got a downright staggering number of various perks and bonuses to select from – perhaps a good few more than was the case with previous Fallout titles. Some of them, like Starched Genes, are a particularly interesting bunch.
Fallout 76 Starched Genes is a perk that has slightly different effects than most, allowing for your character to be less responsive to various radiation-induced mutations that they might come across.”
Source: N4G PC Fallout 76 Starched Genes – How to Get The Starched Genes Perk?