Free Forensic Science Lesson: Fingerprint Patterns (Self-Grading Google Form)

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What students do

Learn. A short case reading introduces the three fingerprint pattern families and why ridge patterns stay the same from before birth until decomposition.
Review. Students classify a set of prints as loops, whorls or arches and read a real frequency table to see which patterns are rare.
Try. Auto-graded questions check the concepts, then a short claim-evidence-reasoning response asks them to argue which pattern a partial print most likely belongs to.

Pattern frequencies students work with

Pattern	Share of the population	Key feature
Loops	about 60-65%	Ridges enter and exit on the same side; one delta
Whorls	about 30-35%	Circular or spiral ridges; two deltas
Arches	about 5%	Ridges flow side to side with a rise in the middle; no delta

What's included

Self-grading Google Form (force-copy link, so it lands in your own Drive)
Teacher lesson plan with pacing, standards and the full answer key (PDF)
Works for in-class, sub days, homework or homeschool
Aligned to CCSS RST.9-10.1, RST.11-12.1, WHST.9-10.1

How to use it

Open the link, click Make a copy, and assign the copy through Google Classroom or share the link directly. Grades appear in the form's Responses tab. No printing required, but the lesson plan includes the questions if you want a paper version.

This is case 6 of 20

The Forensic Science Concept Modules cover the full year in the same format: crime scene processing, trace evidence, blood spatter, DNA, time of death, toxicology, ballistics, arson, questioned documents and digital forensics. All 20 self-grading cases, in curriculum order, for less than $3 a lesson.

See the 20-case bundle

Teaching the whole course? The Forensic Science Workbook puts the daily warm-ups and all 20 cases in one printed book for homeschool and independent study.