Table 4.

Mean pretest, posttest, and learning gain scores for students, TAs/LAs, and genetics experts

	na	Mean pretest (± SE), %	Mean posttest (± SE), %	Mean learning gain (± SE), %
Students	607	40.5 (± 0.6)	74.0 (± 0.7)	56.7 (± 1.0)
TAs/LAs	18	76.9 (± 3.7)	87.8 (± 3.8)	40.0 (± 12.1)
Genetics experts	10	NAb	93.0 (± 5.2)	NA

^aNumber of people who took the GCA. Students were enrolled in either majors or nonmajors genetics courses at three different institutions. TAs and LAs were graduate and undergraduate students, respectively, at CU. Genetics experts from several institutions (see text) who took the GCA are included for comparison.

NA, not applicable.