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Is there anything more to this question? I dont see the problem? 2 wild types mate to give wild type offspring. If the problem relates to ratio of male is to female, then I would say the hypothesis is that an individual offspring has a 50% change to be male or female. Although the numbers do not reflect this, this is skew is often seen in nature. Maybe there is a bias towards x chromosome sperm success rate in competition for fertilization.

To design an experiment to see if this is a constant trend for a ratio of more females to males. you can breed your Drosphila for several generation to see the outcome. is it 50/50? is it always more female to male. If so is it the male or female that determines the sex ratio? maybe you can do invitro fertiliation. do you get the same result?