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similarity of sports

Her an attemp to explain in short your questions
 First a definition:
 A sport is a shoot deviating from the mother plant
 This deviation can be due to 
1.mitotic recombination
2.chimeral rearrangement
3. rarely a mutation
4. other causes

ad 1. a yellow plant getting a green edge
ad 2. a green or yellow shoot from any  variegated plant
ad 3. a variegated plant from a green.blue one like June
( see my rule of thumb in the journal)

In the case of 1. and 3. all similar looking sports are, genetical at
least, different. In the case of 2. all similar sports are identical
like the  green sports from Spilt milk.  More details in the next
Ben J.M.Zonneveld
Clusius lab pobox 9505
2300 RA Leiden
The Netherlands
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