Showing posts with label Models. Show all posts
Showing posts with label Models. Show all posts

Monday, April 16, 2018

Modeling DNA Replication

A few years ago, I decided that I really wanted to focus on ensuring that my students understood the process of DNA replication. While diagrams and videos were available online, I wanted the students to actually interact with the process. I have used this modeling activity with my middle school students for several years with great success, and I hope your students enjoy it too.



Here, you see students working together to apply the base pair rule as they model DNA replication.






After working with the model in a small group, students put what they have learned into their notes, in words and pictures.


I created these manipulatives out of simple craft foam so they last from year to year. Be sure to create helicase and DNA polymerase as well.



The models help students understand that base pair rule and the steps of DNA replication, and can even be extended to teach RNA and transcription. 

Thursday, March 23, 2017

Concept Models - Assessments that dig deeper

At the end of an activity, lesson, unit, or year, teachers want to know what students have learned. Traditionally, students are asked to answer questions in the form of a test or quiz to see what they have learned. As we know, these assessments often ask students to recall or recognize information, rather than show what they truly and deeply understand.

Over the past few years, I have begun asking my students to draw and write out models for the key concepts we are studying. Each unit is broken into modules (which I call Missions) and each mission has an essential question. 

Sometimes, I have students answer this question before we begin the module, and then again after, having them reflect on how their ideas have changed over time. This allows students to see that they are learning, and allows me to see what they understand.

In the concept model to the right, you can see how much more the student understands after the module, both from how she explains and based on her self-drawn diagram.



In other modules, students complete a concept model at the end of a unit as part of an assessment. The examples below show models students completed after a unit on river systems. This line of questioning helps me know that students are doing more than just memorizing the vocabulary terms.