visible mutant (") of an unknown gene, which induces tumor metastasis. y/Y; TM3, Sb X X;/TM3, Sb (wild type: black body, long bristle) (mutant: yellow body (y), short bristle (Sb). If zacharys expectation is correct, what percentage of long bristle progenies will show the tumor metastasis phenotype? a. 0% b. 25% c. 33% d. 50%.