Question

Colorium is an autosomal dominant trait in Nutonian flies (identical to earth fruit flies in every way). There are two alleles at this locus: F = Dominant allele; flies with this allele cannot observe the color Fuschia; these flies have the Colorium phenotype. + = Wild type allele; flies who are homozygous for this allele can observe the color Fuschia; these flies do not have the Colorium phenotype. A cross of a true breeding male with Colorium and a true breeding female without Colorium produces F1 offspring that all have the Colorium phenotype. When a intercross is performed with two F1 flies, we expect the following results in the F2 generation: A. Only Fuschia-colored Nutonian flies will have the Colorium phenotype. B. Half of the female F2 offspring will have the Colorium phenotype. C. 25 % of the F2 offspring will have the Colorium phenotype. 50 % of the F2 offspring will have the Coral phenotype. 25 % of the F2 offspring will have not have the Colorium phenotype. D. 75 % of the F2 offspring will have the Colorium phenotype. 25 % of the F2 offspring will not have the Colorium phenotype. E. 25 % of the F2 offspring will have the Colorium phenotype. 75 % of the F2 offspring will not have the Colorium phenotype.

Answer 1