From the fly cross with 3rd chromosome balancer below, zacnary expecis a visible mutant (*) of an unknown gene, which induces tumor metastasis. /Y;; TM3, Sb Xy;/TM3, Sb (wild type: black body, long bristle) (mutant: yellow body (y), short bristle (Sb). if he observes recessive lethality from the * mutant, what percentage of all adult progenies will show short bristle? a. 0% b. 25% c. 33% d. 50%.