Topic 3. Mendelian heredity for genetic disorders. As you know from Chapter 9, Mendelian heredity doesn’t apply to most human traits. For one thing, most traits are controlled by more than one gene. There are also issues of codominance, incomplete dominance, and pleiotrophy. Yet, Mendelian heredity is still medically relevant.
Genetic disorders that are due to a mutant allele of one gene typically do follow Mendelian inheritance pattern. Explain why this is so.