Although genetics is well-established topic in lower secondary school curricula (ISCED 2), students still have difficulty understanding the basic principles of inheritance and hold various misconceptions about it. To identify the factors influencing the student's understanding the analysis of textbooks, a questionnaire survey among teachers and test of students' understanding were conducted.
Results showed that teachers are qualified in the subject of genetics, but the topic itself is scattered among the curriculum, which makes it hard for students to understand the concepts clearly. School lesson modifications to prevent misconceptions are discussed.