In fruit flies, the allele for red eyes, R, is dominant. Witch genotype represents a white-eyed male fruit fly?

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.

you know they are heterozygous for a trait because they have it as jj or jj.

to this answer it would be edge enhancement