Idle Mind, Thanks for the reply. Actually, we sometimes found some rare offsprings matches about 90% in appearance & character, with any one of the partner. So, can it be possible that the mutation/fertilization of DNA is in the blank ova of any one partner only like it happened in cloning. It may be related to some partners who may be having some problems in carring out the natural process & may get only one child. It can be a very important & rare condition.