[EBB Sightings] White turkeys?

If I saw a wild turkey that was white or had significant white feathering, I 
would suspect that somewhere in the bird's ancestry is a domestic turkey. 
Possible?  I don't know much about the origins and overall movements of the 
turkeys that in recent decades have seemingly taken over large areas of 
rural (and urban!) California.  When I started birding back in the late 
1960's "wild" turkeys were quite localized in California. Now they are 
everywhere.  Could some of these more newly introduced birds have been 
wild/domestic hybrids?

Doug Greenberg, Berkeley