above 25°C it will curl. in between 25°C and 16°C it will curl a little bit. below 16°C it will be straight.
Extra info on The wings of fruit fly:
Some fruit flies are born with curly wings which makes them unable to fly. It has been shown that curly wings are caused by a dominant gene which can be represented by the symbol W, while the recessive normal wing gene is represented by the symbol w. If a parent fly with the genotype WW is crossed with a parent of the genotype Ww, 100% of the offspring will have curly wings.
I go through live thinking that I can be the best person if you focus, and are charitable. You can too! So, whoever you are. You are the best person because you are you and no one else is as truer as you!