This type of horse is called ...
A black horse
The gene that causes white, frayed Overo patches is the dominant gene - just one copy is enough for patches to appear. In homozygous combinations (two copies from both parents) the gene is lethal - a blue-eyed foal dies in three days.
reach: rather globalhorsesnaturezoology
+1 Very interesting! globalquiz.org
+1 Very interesting! misanthrope
+1 Very interesting! Ninjai