Make-a-Model

Students model how mutation increases genetic variation during asexual and sexual reproduction.

1. Students can complete their models in a variety of formats (e.g., on small or large paper, on whiteboards, electronically).
2. Choose the appropriate level of scaffolding for your students:
   1. Provide prompts and allow students time to productively struggle with the concepts.
   2. Have them use the student sheets from the previous two activities as a resource.
   3. Provide ideal models of sexual and asexual reproduction (see Answer Key).
3. As students work on their models and complete Part 3, they may wish to review the Reproduction & Variation slideshow.

• Mutation contributes to genetic variation, which underlies trait variation.

“The environment determines which traits will appear in a population.” This idea often comes up when students talk about natural selection or evolution—that somehow an environmental change causes a new trait to appear. In reality, genetic (and trait) variation appears at random, all the time, during reproduction. This point is worth emphasizing early and often.

Copies
Whiteboards or paper
As needed: scissors, markers or colored pencils, glue or clear tape

Student Sheet (pdf)
Reproduction & Variation (slideshow)

• What are some key differences between sexual and asexual reproduction?
• Which type of reproduction produces more variation? Why?