People actually make that "cross"? I thought selfing was taking pollen from a female with induced male buds and pollinating female buds with the resulting pollen. I thought seeds produced from a selfed plant would have different gene combinations (I may be incorrect). I meant taking e.g. two clones from one branch, turning one into a male, and "crossing" it with the other clone, which is genetically identical. I am thinking as well of taking a clone from a clone, turning one male. To me that seems too closely inbred.
In case anyone is wondering where I got the idea, it was from reading some article about a mare which was cloned and the clone implanted in the donor's uterus. Was the resulting foal its sister, its daughter, itself?