I found a brighteye mutant in fruit flies and wanted to find

I found a bright-eye mutant in fruit flies and wanted to find out in what gene this mutation occurs. I had 2 known stocks with similar phenotype caused by mutation in known genes, vermillion (v) and cinnabar(cn). In a cross of my bright-eye mutant with a pure vermillion line of all off spring had bright eyes. In a cross of a male from my mutant line to a female from cinnabar line all offspring have wild type (dark red) eyes. In a cross of a female from my mutant line to a male from the cinnabar line all female offspring wild type, all male off spring have bright eyes. Did I identify my new mutation to a gene? If yes to which one? If not, which additional cross is needed to identify my new mutant? Explain all results. Is my of the 3 mutations in question sex-linked? Predict F_2 in the last cross?

Solution

The fruit flies show just a few mutation that occur in natural fruit fly populations. The genetic instructions to build a fruit fly or any other organism is imprinted in its DNA, a long thread like molecule packaged in bundles calld Chromosomes.