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 complementation cross is performed (with true breeding flies), we expect the following results:

Answer 1

All of the offspring will be with the Colorium phenotype

Step-by-step explanation:

A cross of a true breeding male with Colorium and a true breeding female without Colorium is:

P: FF x ++

F1: F+ F+ F+ F+

After the complementation cross F+ x FF

F2: FF FF F+F+

All of the offspring will be with the Colorium phenotype