This is actually a teacher's packet about biodiversity, but I really like their genetics resources. You can also find online games for the same resource here. Both are World Wildlife Fund projects.
Here is another interactive game, Genetics Kids Style.
Though this teaching packet is intended to accompany a film, it works great as an independent resource. You will find worksheets and activities.
A hands-on heredity unit can be downloaded here. It includes a family tree activity using one trait that the student chooses. The best part of this unit is the "Alien Genetics Activity" which "gives students the chance to construct a model “alien” with hereditary traits following classical or Mendelian genetics."
- Native Americans