Final answer:
The ethnic background of a teacher is not an important factor to consider when evaluating student achievements and aptitudes across different cultural backgrounds. Important factors include social experience variations, biases in assessment tools, and teacher expectations, which all affect students' performance and access to opportunities.
Step-by-step explanation:
The factor that is not important to remember when considering the levels of achievement and aptitudes of students whose cultural background differs from the dominant culture is D. the ethnic background of a teacher.
When considering student achievements and aptitudes, it is crucial to understand the impact of cultural background and social factors. Factors such as variations in social experiences, bias in measurement instruments and teaching materials, and teacher expectations are important as they directly influence students' learning outcomes and opportunity for success. Instruments like IQ tests often reflect cultural knowledge which can disadvantage students from less affluent backgrounds.
The established power structures in education are also maintained through biased assessments, teacher behavior influenced by discriminatory attitudes, and disparities in access to educational resources. However, the ethnic background of a teacher is not as significant a factor in understanding a student's academic achievement or aptitude as these are largely determined by the environmental and systemic conditions of the educational settings rather than the personal attributes of the educator.