What This Document Is
This is a case study titled “I Scream for Ice Cream” designed for a General Biology I course (BIOL 121) at Old Dominion University. It presents a relatable scenario – a group of international students discussing dairy intolerance – to introduce the biological concept of lactase persistence. The document uses a narrative approach to explore how the ability to digest lactose varies geographically and among different populations. It’s framed as a discovery process, with students prompted to analyze data and draw conclusions.
Why This Document Matters
This case study is valuable for students beginning to explore the intersection of genetics, evolution, and human biology. It’s particularly useful for those who benefit from learning through real-world scenarios and data analysis. It’s likely used early in the course to build foundational understanding of population genetics and adaptation. The document provides a context for understanding why certain traits are more common in some populations than others, moving beyond abstract definitions to a tangible example.
Common Limitations or Challenges
This document is a starting point for investigation, not a comprehensive explanation of lactase persistence. It doesn’t delve into the molecular mechanisms of lactase production or the specific genetic mutations involved. It also doesn’t cover the broader implications of dietary adaptations in human evolution. Students will need further instruction and resources to fully grasp the complexities of the topic.
What This Document Provides
The full document includes:
* A narrative case study involving international students and their experiences with dairy.
* A map (Figure 1) visualizing the geographic distribution of lactose tolerance and intolerance based on a student survey.
* Data presented in a bar graph quantifying dairy tolerance levels across different regions.
* A series of questions designed to guide students in analyzing the data and identifying patterns.
This preview *does not* include the answers to the questions, the detailed data from the survey, or a full explanation of the biological principles underlying lactase persistence. It is intended to give you a sense of the case study’s approach and scope.