Problem 1: Crossing a white-eyed female and red-eyed male fly
In a cross between a white-eyed female fruit fly and red-eyed male 0% of the female offspring will have white eyes.
Problem 2: Another white-eyed female x red-eyed male fly cross
All of the females will have red eyes; all of the males will have white eyes.
All of the females are red-eyed and heterozygous. All of the males are white-eyed female and homozygous.