That's the point of the article though, it's nothing to do with the father's DNA and chance.
Mitochondrial DNA always comes from the mother and does not have a chance to be paired with the father's DNA.
This yields two concequences:
1. If a mother has a disease linked to mitochondrial DNA then the child is 100% sure of having it, since the egg's mitochondia IS the mothers
2. m-DNA doesn't mutate via sex, the disease will not 'bred' out of the population - it ranomly mutates at a much slower rate
The reason this is significant is that m-DNA doesn't alter the charaterastics of the person (in terms of looks, build, eye colur). And so man has crafted a way of ensuring the survival of the mother's defining genes, inspite of a faulty (hard to repair through natural selection) mechanism.
>>so you could remove or add 'gay' DNA
No - there's no such thing as gay mitochondria