Yeah, Yen's pretty much got it... flightless have wings but messed up muscles, wingless (duh), and curly wings have the *curly Oster (CyO)* balancer chromosome (genetics...) which is lethal with homozygotes (i.e. two copies of the gene) and if you cross two flies with curly wings, if you draw a punnet square (again, genetics) - of the offspring, 1/4 will die in in the fly, 1/2 will have the curly wing and 1/4 will have the normal wings. I'm not sure about the other two, but that's the genetics behind the curlies...
To maintain a stock:
Take out maybe 10 PUPAE and separate them until *hatching* - if they hatch and they're winged, throw them. Mate the ones that are curled (i.e. the wings do not fit flat on top of each other).
Like i said, 1/4 will be potentially winged.
The reason why i say collect the pupae is that once adult, you won't know whether they've already mated with the winged flies or not.
-but on that topic, livefoodsdirect made a mistake in my order and instead of getting locusts, crix and flies, I got 3 sets of flies... hopefully this is being rectified but it's easy to see the difference when you have all 3 infront of you
