|MadSci Network: Genetics|
In the case of human genetics, some characteristics are simply a case of dominant over recessive, and others are more complex with a number of different genes interacting together to produce a certain trait. Eye color and hair color are at the same time complex traits and simple. For the particular traits you are interested in, it is pretty easy though. It is well known that dark hair is dominant over light hair, and dark eyes are dominant over light colored eyes. If the Ojibwa Indian woman is full-blooded, then it is with almost 100% assurance that her offspring, regardless of the fathers heritage, will have brown eyes and dark hair. I say near 100% cause you never know when there might be a mutation in a gene that would cause an unexpected result. If the mother is 1/4 French, then it is very possible that her offspring could have blue eyes, or maybe hazel, though her hair would most likely still be dark. I don't have any statistics on the likely-hood of this, but the mere fact that it is possible is good enough. Non-red hair is dominant over red hair, so again the child's hair will be dark. As an example, if you take a look at the child of one white parent, and one black parent(assuming both are of unmixed heritage), the child will have dark hair, and dark eyes. The skin may be a little lighter, and other characteristics may be more like one parent than the other, but eye color and hair will almost always be dark. Hope this helps, and good luck with the book.
Try the links in the MadSci Library for more information on Genetics.