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The reason orchids are so weird is that the genes which control the development of the flower are all on a single section of the DNA (just one chromosome, IIRC) which doesn't do anything else. This means random changes to the flower can take place without messing up stuff like the plant's biochemistry and overall structure.
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Shut up and hug. MoreThanPretty, Nov 5, 2008.
Just because I'm nominally polite, does not make me a pussy. Sundae Girl.
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