In one organism, neurons in animals with this trait express Gustatory receptor 68a. Jonathan Hodgkin developed “high incidence” mutations in one organism to increase this trait’s frequency from its 0.2% wild-type rate. In that model organism used by Horvitz and Sulston, L1 to L4 animals with this trait have a linker cell (-5[1])that migrates towards the cloaca (“klow-AY-kuh”). In another species, third-instar larvae with this trait have pronounced translucent discs and later develop (*) “combs” on their front legs. Adult (10[1])C. elegans with this trait (-5[1])have a blunt tail with a fan (-5[1])and rays among their 1,033 somatic cells. Adult Drosophila (-5[1])with this trait are smaller (10[1])than their counterparts (10[2])and have a darker, rounded (10[1])abdomen. (10[1])For 10 points, Thomas Hunt Morgan testcrossed a fly with white eyes and (-5[1])what sex, which is conferred in mammals by the gene SRY? (10[1])■END■ (10[4]0[1])