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Sports can arise different ways 
1.green changing to variegated it is a sport due to a mutation
2.yellow changing to variegated it is a sport due to mititic 
recombination ( the same is true for blue changing to green)
3.variegation changing to another variegation or to green or to 
yellow is a sport due to chimeral rearrangment 
4 there are other more rare possibilities

I agree there are big differences between species but also between different 
cultivars in the frequency of mutation. If you tc a green one what 
is the frequency of mutation? Even in hosta this is low, I suppose.
 Can you give any example of plants that give 75-100%  sports that are not 
due to chimeral rearraggements?
Ben Zonneveld, Leiden University, Dep Genetics
pobox 9505, 2300 RA Leiden, The Netherlands           
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