Could you tell me the number for ? us military abbreviation and acronyms list The researchers used whole genome sequencing in order to characterize the complete set of DNA in the total population of the fruit flies. They then noted differences in the genetic makeup between the populations on the opposing slopes. In the end, they found that 572 genes were significantly different in frequency between the populations, corroborating previous observations of differences in heat tolerance, life history and mating behavior. In addition, the researchers confirmed migration between the slopes by capturing and marking the flies with florescence.