In the past, I have encountered difficulty in getting my middle school science students to understand the DNA-gene-code-protein pathway. To help with this, I made a powerpoint that compares the genetic information in a cell's DNA to the written information in an encyclopedia.
To further this analogy, I compared the process of reading a topic in in an encyclopedia (such as "ice cream") for textual information to the way that ribosomes "read" the DNA code in a specific gene to gain genetic information on how to build that protein.
Hopefully, this can help your students understand the essentials of the central dogma of biology without having to go to an upper high school level of detail.
Hope you enjoy!
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