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[–] Apoplectic1 0 points 1 point (+1|-0) ago 

Yeah. I doubt the gestational period of flies is that long, and depending on the time between insemination of fly A and fly B, there is a fair chance the semen may have still have been present in the female fly. If say a ferret had sex with ferret A last mating season (I'm assuming ferrets do the whole mating season thing) and then sex with ferret B last week and is impregnated with ferret B's offspring, what is the likelihood of ferret A's DNA playing a role in the offspring?