Medical Genetics Galton noticed that extremely tall fathers tended to have sons shorter than themselves, and extremely short fathers tended to have sons taller than themselves, Tallness or shortness didn't breed true like they did in Mendel's regress to the median, or "mediocrity cO pea experiments. The offspring seemed toMedical Genetics Galton noticed that extremely tall fathers tended to have sons shorter than themselves, and extremely short fathers tended to have sons taller than themselves. "Tallness" or "shortness" didn't breed true like they did in Mendel's pea experiments. The offspring seemed to regress to the median, or "mediocrity