DNA Mutations

Inside the case file

Crack the genetic code. This printable DNA Mutations Science Mystery turns a nonfiction science passage about how DNA can change into a science-detective investigation for Grades 5–8 science teachers, homeschoolers, and tutors. It drops straight into a genetics, heredity, or life science unit and hooks students into reading for the evidence.

The case only cracks if students read for detail; each text-based answer rules a suspect out until one remains. Print-and-go, zero setup.

Quick Details

Grade Levels: Grades 5–8
Format: Printable PDF
Resource Type: Science Mystery worksheets
Reading Skills: Nonfiction science comprehension, text evidence, main idea, cause and effect, and science vocabulary
Science Standards: Supports NGSS MS-LS3-1
Tech Needed: None — no apps, locks, passwords, or student logins required

The Case

Something in the DNA does not add up, and a line-up of suspects is waiting. The only way to crack the case is to read closely about DNA mutations — what DNA is, how mutations happen, and the effects they can have — using every comprehension answer as a clue to rule a suspect out, until just one remains.

How the Science Mystery Works

As Science Detectives, students read about DNA mutations and use each correct answer to knock out a suspect until one is left — the passage is the only way through.

What's Included

• A "You are a detective" case-file page that sets the scene and the mission
• An engaging 2-page informational text on DNA mutations (what DNA is, how mutations occur, and their effects)
• Multiple-choice comprehension questions (all answers found in the text)
• Open-ended written response questions
• A suspect line-up page for eliminating suspects one clue at a time
• A science vocabulary word search and extension activities for early finishers
• A full answer key
• Color and black-and-white versions
• Print-and-go PDF format

Skills Covered

• Reading and understanding nonfiction science text
• Finding and using text evidence
• What DNA is and how mutations to genes can affect structure and function
• Cause and effect and drawing conclusions from evidence
• Science vocabulary in context
• Logic, reasoning, and critical thinking

Best Used For

• Genetics, heredity, and life science units
• NGSS-aligned review and inquiry lessons
• Science and nonfiction reading comprehension
• Science centers, test prep, sub plans, and small groups
• Homeschool science