Sensitivity Notes: This resource addresses Trisomy 13 and its effects on development with intentional, person-first language throughout. Trisomy 13 is a severe genetic condition, please use this resource with sensitivity with students. The article uses inclusive language including "pregnant parent," and describes developmental differences with care and accuracy.
Challenge your high school biology students to trace the biological consequences of a single error in meiosis with this rigorous, NGSS-aligned CER writing activity. Using a background reading on meiosis and an 8-page informational article on nondisjunction and Trisomy 13, students develop a complete evidence-based response to a multi-part scientific question — connecting cellular division errors to their effects at the organism level.
This activity builds close reading, scientific reasoning, and structured writing skills in a single cohesive lesson. No additional resources required.
The Central Question: "Describe the chain of events from nondisjunction to the development of Patau's Syndrome. How does a single error in cell division affect an entire organism?"
What's Included:
Background reading on meiosis: Reviews key concepts before students engage with the article
8-page informational article on nondisjunction and Trisomy 13, with citations
Two structured drafting pages guiding students through their CER response
Peer review page for structured feedback before final submission
Instructor rubric for clear, consistent grading
Why Teachers Love It:
Connects abstract cell division concepts to real biological outcomes deepening understanding beyond the phases of meiosis
Builds NGSS-aligned scientific argumentation and writing skills
Structured scaffolding supports a wide range of writers
Pairs naturally with meiosis, genetics, and chromosomal abnormalities units
Complete and ready to use, no prep required
Perfect For:
Grades 9–12 biology and life science classrooms
Meiosis, genetics, and chromosomal variation units
Performance tasks and extended writing assessments
Reinforcing the connection between errors in cell division and their consequences at the organism level
Sensitivity Notes: This resource addresses Trisomy 13 and its effects on development with intentional, person-first language throughout. Trisomy 13 is a severe genetic condition, please use this resource with sensitivity with students. The article uses inclusive language including "pregnant parent," and describes developmental differences with care and accuracy.
Challenge your high school biology students to trace the biological consequences of a single error in meiosis with this rigorous, NGSS-aligned CER writing activity. Using a background reading on meiosis and an 8-page informational article on nondisjunction and Trisomy 13, students develop a complete evidence-based response to a multi-part scientific question — connecting cellular division errors to their effects at the organism level.
This activity builds close reading, scientific reasoning, and structured writing skills in a single cohesive lesson. No additional resources required.
The Central Question: "Describe the chain of events from nondisjunction to the development of Patau's Syndrome. How does a single error in cell division affect an entire organism?"
What's Included:
Background reading on meiosis: Reviews key concepts before students engage with the article
8-page informational article on nondisjunction and Trisomy 13, with citations
Two structured drafting pages guiding students through their CER response
Peer review page for structured feedback before final submission
Instructor rubric for clear, consistent grading
Why Teachers Love It:
Connects abstract cell division concepts to real biological outcomes deepening understanding beyond the phases of meiosis
Builds NGSS-aligned scientific argumentation and writing skills
Structured scaffolding supports a wide range of writers
Pairs naturally with meiosis, genetics, and chromosomal abnormalities units
Complete and ready to use, no prep required
Perfect For:
Grades 9–12 biology and life science classrooms
Meiosis, genetics, and chromosomal variation units
Performance tasks and extended writing assessments
Reinforcing the connection between errors in cell division and their consequences at the organism level
