A question on my BIO156/181 Unit 5 exam addresses Mendelian genetics and the inheritance of a trait from parents. The trait in question is inherited in a simple Mendelian manner (one gene with two alleles, one allele being dominant and the other allele being recessive.) Originally the question was about hitchhiker's thumb and involved a kind of "double negative" statement, where "lack of the thumb" was dominant. I think this wording was making it hard for students to think through the problem. I reframed the problem using the trait of wet or dry earwax instead of having / lacking hitchhiker's thumb to see if scores improved. When the wording of wet vs dry earwax was used, students scored, on average, one point higher (6/9) on the problem when compared with a similar cohort of students (the previous semester) who were given the "have vs lack" question wording. I will continue to use the wet vs dry earwax question on this exam.