A cross between homozygous red-eyed flies and homozygous white-eyed flies results in progeny that all have red eyes. this result demonstrates:

This result demonstrates dominance.

In genetics we refer dominance as the relationship between alleles of one gene or the phenomenon which occurs in an individual which is containing two allelic forms of a gene and one allelic form of gene is expressed to the exclusion of the other allelic form of gene.