The following resources are available free online and can answer many of your questions about DNA and paternity.
American Coalition for Fathers and Children
The American Coalition for Fathers and Children is a non-profit organization dedicated to providing equal rights to anyone who has been affected by divorce, paternity, and other familial situations.
Paternity Information Page
DADS is a non-profit, tax-exempt corporation. This website, created by men, provides information about paternity and fatherhood.
Fatherville.com
This site encourages men to become better fathers by exchanging ideas as well as offering and receiving advice.
The Men’s Resource Network
The goal of the Men’s Resource Network is to help men find information, resources, and support in any situation.