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Ethics Panel Endorses Mitochondrial Therapy, But Says Start With Male Embryos (sciencemag.org)
sciencehabit writes: An experimental assisted reproduction technique that could allow some families to avoid having children with certain types of heritable disease should be allowed to go forward in the United States, provided it proceeds slowly and cautiously. That is the conclusion of a report released today from a panel organized by the U.S. National Academies of Sciences, Engineering, and Medicine (NAS), which assesses the ethics questions surrounding the controversial technique called mitochondrial DNA replacement therapy. More controversially, however, the panel recommended that only altered male embryos should be used to attempt a pregnancy, to limit the possible risks to future generations. (Males can't pass along the mitochondrial DNA that is altered in the procedure.)
You are correct. Sperm have all of their mitochondria located by the flagellum, not spread throughout the cytoplasm of the main body, which makes sense due to the fact that the real energy expenditure in a sperm cell is going to be movement.
The mitochondria and flagellum are left behind as a distinct unit when the main body merges with the egg. So, there are no male mitochondria in the resulting fertilized egg. There could be some sort of odd condition that allows something like the sperm mitochondria to make it inside the egg, but if that happens it is not the rule, and probably means that something is wrong.
That is why you will only inherit mitochondria via the female line, which has had an interesting ability to aid in tracing human migrations through history.
Since TFS didn't explain what "mitochondria" are, I had to look them up myself and found a documentary about them. One scientist explains them as:
Mitochondria are a microscopic lifeforms that reside within all living cells. And we are symbions with them. Without the mitochondrians life could not exist and we would have no knowledge of the Force. They continually speak to us telling us the will of the Force.
I hope this helps.