Rate of Spontaneous Mutations

[travis]

Does anyone have an idea or a link to information regarding
what the true rate of spontaneous mutation is in tomatoes?

Like ... at what rate could one anticipate something like
a spontaneous mutation occuring in a huge population
of a known to be stable red fruited tomatoes that
would result in a single plant bearing yellow fruit?

In other words ... how many plants of a single
cultivar would one have to grow in a single season
to anticipate a single spontaneous mutation
among that crop?

PV