Forensic Science Unit Plan: DNA, Fingerprints & Trace Evidence | Grades 9-12

Engage your high school students with this rigorous, 3-week Forensic Science unit focusing on biological and trace evidence. This comprehensive, print-and-go resource includes 15 detailed lesson plans, a classroom-safe DNA extraction lab, fingerprint classification guides and practice cards, hair and fiber microscopic analysis, a CODIS database explainer, and a culminating mock crime scene evidence challenge. Designed specifically for grades 9–12, this unit brings real-world forensic science directly into your classroom!

Give your students the experience of real forensic investigators! From extracting visible DNA using safe, everyday materials to analyzing STR profiles and comparing fingerprint minutiae, this unit builds essential scientific inquiry and analytical skills.

🧬 What’s Included :

Unit Overview & Pacing Guide: 3-week day-by-day pacing guide, essential questions, learning objectives, NGSS alignment (HS-LS1-1, HS-LS3-1, HS-ETS1-3), and materials list. 15 Detailed Lesson Plans: Step-by-step instructions for every lesson, including warm-ups, direct instruction, guided/independent practice, and closure/exit tickets. DNA Extraction Lab Protocol: A classroom-safe, step-by-step lab using strawberries, dish soap, salt, and cold isopropyl alcohol. Includes pre-lab theory, data observation tables, and post-lab analysis questions. RFLP & STR Profiling Basics: Clear instructional content comparing historical RFLP to modern STR analysis, including a paper-based gel electrophoresis simulation activity. Fingerprint Classification Guide: A comprehensive reference covering Arches, Loops, and Whorls (including sub-types like ulnar, radial, plain, tented, double-loop), the Delta Rule, and key anatomical landmarks. Fingerprint Practice Cards: Visual practice cards for student classification, complete with an answer key. Fingerprint Minutiae & ACE-V Methodology: Guide for identifying ridge endings, bifurcations, and enclosures, plus the standard ACE-V comparison methodology used by real examiners. Hair Analysis Activity: Microscopic structure identification (cuticle, cortex, medulla), scale patterns, and Medullary Index calculation practice with clear formulas and human vs. animal thresholds. Fiber Analysis Activity: Burn test reference chart for natural vs. synthetic fibers (cotton, wool, silk, polyester, nylon, acrylic). CODIS Database Explainer: Detailed breakdown of LDIS, SDIS, and NDIS tiers, the 20 core STR loci, and Amelogenin sex-determining gene. Evidence Analysis Challenge (Mock Crime Scene): A 2-day culminating activity featuring "The Oakridge High Vandalism." Includes suspect profiles, evidence logs, DNA profile comparison worksheets, trace evidence data, and a final synthesis report. Forensics Vocabulary Guide: A complete, organized glossary of all unit terminology. Unit Assessment & Answer Key: A comprehensive summative test featuring multiple-choice, short-answer, and practical application questions (calculating Medullary Index, classifying prints), plus a full teacher answer key. 🔬 Skills Covered:

Extracting DNA using a classroom-safe protocol and explaining the biochemical function of reagents (soap, salt, alcohol). Comparing and contrasting RFLP and STR DNA profiling methods. Classifying fingerprints by primary pattern type and identifying minutiae for individualization. Calculating and interpreting the Medullary Index to differentiate human and animal hair. Identifying natural and synthetic fibers through burn test characteristics. Explaining the structure and function of the CODIS database. Applying the Chain of Custody and ACE-V methodology. Synthesizing multiple types of forensic evidence to draw scientific conclusions. 💡 How to Use: This unit is ready to teach! Print the vocabulary guides and classification references for student binders at the start of the unit. Follow the 15-lesson pacing guide for a seamless 3-week rollout. Prep for the DNA extraction lab and mock crime scene challenge in advance using the detailed materials lists provided.

Grade Suitability: Designed specifically for High School Forensic Science, Biology, or Criminal Justice courses (Grades 9–12). Content is rigorous enough for upperclassmen yet accessible for freshmen with basic biology prerequisites.