Remember when we learned how to complete Punnett Squares?
If you were looking for a more visual, hands-on way to practice their Punnett square-solving-skills, you can use plastic eggs leftover from Easter.
Assign a genotype to each egg color, such as the following:
Blue - BB
Green - Bb
Yellow - bb
This example uses incomplete dominance - i.e. Bb appears green, not blue, as it would in a straight dominant/recessive situation.