top of page

Lesson 5

How Can We Show That It Takes Many Generations for the Population of Piloses to Change?

Big Idea:

Data and the process of natural selection can explain how a beneficial trait variant becomes more common in an animal population over multiple generations when the environment changes.

gen 5 (2).jpg
gen 3 (2).jpg


Students count thicker, medium, and thinner trunks in pictures of three generations of a pilose population. They record and graph their data. They reason with the process of natural selection to explain how the sequence of graphs shows change in trunk width over many generations.

Materials to Have Ready

​​For each student:

Notebook pages 10-12

For each small group of students:​

A packet of pilosa cards (Generation 1)

Printed pictures of Generation 3 and Generation 5

Download Materials

bottom of page