Human Genetics-- Class Tally: Do You Have a Hitchhiker's Thumb?

In this science worksheet, students study diversity in human genetics by participating in a class survey and generating a tally graph. Students are asked if they have a "hitchhiker's thumb" and the results are displayed on the tally graph. There are close- up photographs to help students match their own thumbs to the right picture.

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4th - 6th
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