In this module, students explore inheritance patterns that extend beyond simple Mendelian dominance. Students use Punnett squares to analyze sex-linked traits, incomplete dominance, and codominance, then read and build pedigree charts to track traits through families. The module concludes with Sonia’s Story, a sickle cell inheritance case study in which students connect red blood cell phenotypes, genotypes, family pedigrees, and inheritance probabilities. Students will learn that different inheritance patterns affct how traits appear in offpring, and that models like Punnett squares and pedigrees can help explain and predict genetic outcomes. An optional mini-lesson on multiple alleles (blood types) allows teachers to deepen or diffrentiate instruction based on district needs.