The Patterns of Inheritance and Applications module illustrates CSEL Science’s inquiry-based learning approach. Students investigate how traits are inherited beyond complete dominance and how genetic models can be used to explain and predict trait outcomes. Across the module, students explore focused questions about sex-linked traits, incomplete dominance, codominance, pedigrees, and sickle cell inheritance. They use Punnett squares and pedigrees as scientific models, analyze patterns in family trait data, calculate probabilities, and use evidence to explain how traits are inherited.

The module culminates in Sonia’s Story, a sickle cell inheritance case study in which students apply what they have learned to explain inheritance in a family. Students connect Sonia’s red blood cell phenotype to her genotype, trace the inheritance of sickle cell trait through a pedigree, and predict possible inheritance outcomes for the next generation. This sequence supports sustained sensemaking: students build understanding over time, use models to reason through increasingly complex inheritance patterns, and apply evidence to explain a meaningful real-world genetics case.

Phenomenon-based Learning

The module is organized around real-world inheritance patterns that cannot be fully explained by complete dominance. Students encounter examples such as red-green color blindness, blended or co-expressed traits, family pedigree patterns, and sickle cell inheritance. These examples give students a reason to investigate how allele combinations and inheritance patterns affect phenotypes. The module culminates in Sonia’s Story, where students apply their understanding of codominance, pedigrees, and probability to explain how sickle cell trait can be inherited in a family. In the optional extension, students connect sickle cell trait to malaria resistance and consider how genetic variation can affect trait distribution in populations.

Inquiry-based Learning

In addition to strong alignment with NGSS three-dimensional learning, Module 7: Patterns of Inheritance and Applications reflects core principles of inquiry-based learning. Students do not simply memorize inheritance vocabulary or complete isolated Punnett square problems. Instead, they use models and evidence to answer meaningful genetics questions. They compare inheritance patterns, analyze family information, construct and interpret pedigrees, calculate probabilities, and explain how genotype and phenotype are related.

The module’s case-based structure supports students in applying genetics concepts to a human health context. In the sickle cell inheritance lab, students investigate Sonia’s family history and use genetic models to explain how she inherited sickle cell trait. Optional extension activities connect sickle cell trait to malaria resistance and trait distribution in populations. Together, these activities support scientific reasoning, collaboration, model-based explanation, and evidence-based writing while maintaining coherence with high school NGSS expectations.