Bluetooth File Transfer is not just for copying files between two devices, you can also use it to edit, create, delete, move and rename files, either on your device, or another Bluetooth-enabled device, such as a PC, smartphone, PDA, or a music player.
Meaning and definition of bottleneck effect : Genetic drift resulting from the reduction of a population, typically by a natural disaster, such that the surviving population is no longer genetically representative of the original population.
Founder effect and population bottleneck are not necessarily examples of genetic drift. The common thing in all three is a resulting reduction in genetic diversity. Genetic drift is a change in allele frequencies due to process of random sampling to form a finite offspring population from parent population.