Will you please cite specific examples and your references.
Second hand information is only rumor.
Kathleen Archer <Kathleen.Archer at trincoll.edu> wrote in article
<3.0.1.32.19991013110134.00698d0c at mail.trincoll.edu>...
> I forgot to add that in cases where plastids are inherited paternally,
> there are mechanisms to insure that plastids are carried to the egg along
> with sperm. I recollect there may be some kind of "silencing" or
> inactivation of egg plastids in order to achieve paternal inheritance.
> Kathleen Archer
>