Final answer:
Hybrid dysgenesis doesn't occur in the mentioned fruit fly crosses because the P element causing genetic instability is not present in the female parent. F1 and F2 genotypes show red or white eyes depending on which P parent exhibits the recessive trait, with red being dominant.
Step-by-step explanation:
In the context of Drosophila melanogaster, or fruit flies, hybrid dysgenesis does not occur in a cross between P male (P element absent) and P female or M male (P element present) and P female because the P element that causes genetic instability is missing in the female parent. The phenomenon of hybrid dysgenesis is observed when P elements are introduced into the Drosophila genome through the male parent in crosses with M females, which lack these elements.
Regarding eye color, an X-linked trait, the F1 and F2 genotypes vary depending on whether the P generation male or female expressed the recessive white-eye trait. If the P male is white-eyed and the P female red-eyed, all F1 progeny will have red eyes due to the dominance of the red eye allele.