The psychic is, quite literally, the new kid on the block as far a psychics go; his name is Tyler Henry, and apparently the basic cable channel E! is really pushing a TV series featuring him, Hollywood Medium With Tyler Henry. His website describes him thusly:
Mitochondrial DNA is only a small portion of the DNA in a eukaryotic cell; most of the DNA can be found in the cell nucleus and, in plants, in the chloroplast. In humans, the 16,600 base pairs of mitochondrial DNA encode for only 37 genes.
Homoplasmy is a term used in genetics to describe a eukaryotic cell whose copies of mitochondrial DNA are all identical. When in normal and healthy tissues, all cells are homoplasmic. Homoplasmic mitochondrial DNA copies may be normal or mutated; however, most mutations are heteroplasmic (only occurring in some copies of mitochondrial DNA).