Final answer:
Without specific details on the traits (broad elongated head and split legs), it is not possible to accurately predict the phenotypes of the flies. However, using principles of Mendelian genetics and X-linked inheritance, the phenotype would depend on whether the alleles are dominant or recessive and the parental genotypes.
Step-by-step explanation:
The phenotypes of flies with different combinations of genes can be predicted by taking into account principles of inheritance, including dominance and recessiveness. However, the information provided does not specify the exact genes or traits related to the characteristics mentioned (broad elongated head and split legs), so it isn't possible to predict the phenotypes of the flies with the given gene combinations directly.
Typically, if broad elongated heads and split legs are traits found in Drosophila melanogaster and follow Mendelian genetics, the specific phenotype would depend on whether the alleles for these traits are dominant or recessive. Without this information, one cannot determine the phenotype based on gene combinations alone.
From the provided reference material, we can infer the principles of Mendelian genetics and X-linked inheritance. If we consider the example of eye color in Drosophila, a wild-type red eye is a dominant trait over a white eye, which is a recessive trait linked to the X chromosome. Consequently, in an X-linked cross, the expression of the phenotype in the offspring depends on the genotype of the parents, as illustrated with the white and red-eyed Drosophila.