Since I am not a scientist, I'm going to leave it to the pros to explain it. There is a link to Animal Genetics' website attached to the "learn more" button, it will tell you all about Ichthyosis.
What I want to explain is, now that we have the knowledge about what it is and how it is passed on, what do we do about it as breeders?
Southern Belle Goldens has made the commitment to not pair two carriers together. Also, when we have a litter with one carrier parent, if we have someone who wants breeding rights from that litter, SBG will pay to test each individual puppy for ICH, and only clear puppies will be considered for full rights. We will do this in efforts to stop the further spread of ICH in our breed. It is far too common for something that can be avoided. And I will be the first to admit we were part of the problem until we knew better.