Final answer:
In Drosophila, sex determination is influenced by the ratio of X chromosomes to autosomes. An XXY chromosome complement in Drosophila, considering the autosomes are AA, would result in a female phenotype because the presence of an extra X chromosome pushes the balance towards female characteristics.
Step-by-step explanation:
In Drosophila, which are also known as fruit flies, sex determination is based on the sex chromosome complement. The presence of an XXY chromosome complement in contrast to the typical XY (male) and XX (female) chromosome pairs would result in an intersex fly because of the additional X chromosome.
In Drosophila, the sex determination system is such that a ratio of one X chromosome to one set of autosomes (A) results in a male phenotype while a ratio of two X chromosomes tAo one set of autosomes results in a female phenotype. As the fly in question has an XXY sex chromosome complement and taking into account that the Y chromosome in flies does not have a counterpart to the X chromosome alleles, the 'extra' X would lead to a female phenotype as the balance between the autosomes (AA) and the number of X chromosomes is skewed towards the female-producing ratio.