I bred a spider male to a Normal female last year...Got 11 eggs and only three normals.
To make things better all the normals were female and the spiders were 4.4
Last year from a mojave x normal I got 5 mojaves and one normal.
My best though was with cornsnakes and happened last year. I had a pair of lavenders 66% het stripe. Out of the clutch only two eggs went to term. Out of one of those eggs hatched a striped lavender and in the other was an opal (albino lavender). I didn't even know amel was floating around. So out of two eggs I proved two different hets. I think I calculated the odds of that happening to be around 1/500 with all the poss. hets playing out and the number of eggs that survived.