Serendip is an independent site partnering with faculty at multiple colleges and universities around the world. Happy exploring!

Home › Genetics and Probability – Sex Ratios of Births ›

Genetics and Probability – Sex Ratios of Births

In this minds-on analysis and discussion activity, students analyze the inheritance of sex chromosomes. Students use a Punnett square to predict the sex ratio of births and compare their prediction to data for individual families and for the entire US.

As students analyze the reasons why many real families deviate from Punnett square predictions, they learn about the probabilistic nature of inheritance and the limitations of Punnett square predictions.

The Student Handout is available in the first two attached files and as a Google doc designed for use in online instruction and distance learning. The Teacher Notes, available in the last two attached files, provide instructional suggestions and background information and explain how this activity is aligned with the Next Generation Science Standards.

AttachmentSize
sex ratios SH.docx427.92 KB
sex ratios SH.pdf287.08 KB
sex ratio TN.docx38.42 KB
sex ratio TN.pdf288.55 KB
  • share

Comments

Post new comment

The content of this field is kept private and will not be shown publicly.
To prevent automated spam submissions leave this field empty.
4 + 10 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

Download Minds-On Activities for Teaching Biology

Introduction and Activities Listing

Intro and Biological Molecules

Cell

Cell Structure and Function

Cellular Respiration and Photosynthesis

Cell Division

Cell Division

Genealogy

Genetics

Genealogy

Molecular Biology

Natural Selection

Evolution

Natural Selection

Ecology

Runner

Human Physiology and Health

Subscribe

Subscribe to our listserv to receive notices when we post new activities or significant revisions or when we offer an online professional development.

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. To preserve the value of these learning activities for other teachers, please do not post keys for any questions from any of these activities!

Creative Commons License

Authors

Dr. Ingrid Waldron is Professor Emerita in the Biology Department at the University of Pennsylvania. Co-authors include Dr. Jennifer Doherty, who is an Assistant Professor in the Physiology Department at Michigan State University, and Dr. Lori Spindler, who is a Lecturer in the Biology Department at the University of Pennsylvania. They have developed these activities in collaboration with colleagues at Penn and middle school and high school teachers in the Philadelphia area. We are grateful to Craig Douglas for his generous help with graphics.

 

  • share

Remote Ready Biology Learning Activities

Scanning electron microscope image of SARS-CoV-2

Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.

Narrative is determined not by a desire to narrate but by a desire to exchange. (Roland Barthes, S/Z)

What's New? Subscribe to Serendip Studio