By ethnic-racial relations one understands the relations established between ethnic groups whose base is guided by race category, seen on a social perspective. Schools should be an environment propitious to the promotion of Education for Ethnic-racial Relations, the teacher being an indispensable agent in this process. The present study is characterized as documentary research with a qualitative approach that sought to analyze, in a comparative perspective, evidence of a proposal for Education for Ethnic-racial Relations present and/or absent in the Curriculum Guidelines and in the Common National Base for Initial Teacher Training (Resolution 2/2019), as well as the possible implications for the teaching of anti-racist Science and Biology in Brazil. The study leads us to conclude that the new Curricular Guidelines and the Common National Base for the Initial Teacher Training do not bring concrete evidence of an effective proposal for Education for Ethnic-Racial Relations as proposed by Resolution 2/2015, which was hastily revoked by Resolution 2/2019. The absence of these indications tends to result in negative implications for the teaching of anti-racist Science and Biology, since it was previously supported, we had found in the guidelines for teacher training an alternative to insert the study of ethnic-racial relations in undergraduate courses in the area. We hope that this study will collaborate for research in the area of teacher training and ethnic-racial relations in the teaching of science and biology, especially for educational policies aimed at training teachers.