The document describes the grading system and what each letter grade represents in terms of student understanding and skills. An F represents a failure to understand biological thinking and complete required work. A D demonstrates a minimal level of understanding. A C shows inconsistent skills and understanding. A B shows more strengths than weaknesses with good reasoning skills. An A demonstrates excellence with no major weaknesses. The grading is based on tests, exams, assignments, labs, quizzes, and class participation and discussion. Effort does not directly affect the grade, but influences performance.