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re: wingless fruit flies

Augustine Rodriguez wrote: 

>I have been raising wingless fruit flies for about 2 years with excellent
>results.  When I started out, I had read that the wingless genetic trait
>was regressive and that eventually, the fully formed wings would begin to
>show up in offspring. This has not happened and I was wondering if any
>readers/subscribers have actually had this happen to them.

I've bred generation upon generation of fruitflies while doing genetics
experiments and, although the wingless trait *is* recessive, spontaneous
mutations do occur which promote wing growth.  Hasn't happened often in my
work with them, though.