. . . . "ease, resulting in illnesses such as muscle wasting, nerve damage, blindness and heart failure.Although rare, mitochondrial disease can be passed on to future generations.The new rules would allow IVF (in-vitro fertilisation) clinics to replace a baby???s defective mitochondrial DNA with healthy DNA from a female donor???s egg.This would result in babies having DNA from two parents plus a tiny amo" . .