1. What is the significance of using upper- and lowercase versions of the same letter (for example, A and a) for the dominant and recessive trait, respectively, rather than a capital A for dominant and a B (or b) for recessive?
2. Why do harmful genes remain in the human population?
3. Mendel's work depends on his utilization of an optimum organism for genetic study, the pea plant. What makes this plant excellent for genetic study? What types of issues arise from organisms such as humans in the use of genetic study?