The rapid spread of knowledge forces the countries to make radical changes in political, economic and social issues. These changes have revealed the necessity of raising qualified people. We can say that the role of the teacher in our educational ecosystem is very important and sensitive. As a matter of fact, the importance of the teacher in the education system was emphasized in the report Education 2023 Vision and MEB Teacher competencies. In this study, it was aimed to determine the opinions of biology teachers about Biology Teaching Undergraduate Program. A case study, one of the qualitative research methods, was used in the study. The study of group of the research consists of 44 biology teachers who work in the different provinces of Turkey in the academic year of 2018-2019. A structured interview form prepared by the researchers was used to collect data. In the analysis of the data, the percentage and frequency with descriptive statistical values were calculated. Also, sample teacher opinions are presented. According to the findings of the study, the reduction of the course / laboratory hours in the field of biology, the integration of the course / laboratory contents and the removal of some courses / laboratories biology teacher candidates are thought to adversely affect their field knowledge. As a result, the quality of education they receive in undergraduate education is an indispensable element for professional development and teaching profession competencies of biology teacher candidates. Therefore, undergraduate programs need to be deepened instead of narrowing down the field.