AbstractThis study is aimed to develop a valid and reliable three-tiers diagnostic test in genetics.
The study also aimed to assess pre-university students’ level of understanding and
misconception in genetics by utilising the developed test and to explore the
misconception issue. It has employed a developmental design involving adaptation,
validation and pilot study phase. The test named as Three-Tiers Diagnostic Test in
Genetics (3-TDTG) consists of 15 questions was administered in the empirical study.
Ten biology experts and 30 pre-university students were involved in the developmental
phase, whereas 455 students of a matriculation college in northern peninsular Malaysia
involved in the empirical study. Seven of them were purposely selected to be
interviewed, along with six biology lecturers. The findings suggest the 3-TDTG to be
valid with S-CVI values of 0.98 and 0.96 for face and content validity respectively. The
false positive and negative value was minimised to 10.90% and.....