MendelWeb: a public sourcebook on classical genetics:
www.stg.brown.edu/MendelWeb/

Pedigree of sex-linked colorblindness:
wsrv.clas.virginia.edu/%7Erjh9u/xped.html

Pedigree of hemophilia in royal families of Europe:
wsrv.clas.virginia.edu/%7Erjh9u/roylhema.html

What is Inheritance? primer from the Natural History of Genes:
raven.umnh.utah.edu/review/redo/core.html

The Interactive Fly--Drosophila genes:
sdb.bio.purdue.edu/fly/aimain/1aahome.htm

Recessive and Dominant Inheritance
http://www.accessexcellence.org/AB/GG/recessive.html

Mendel: Experiment 1
http://www.accessexcellence.org/AB/GG/mendel.html

Human Heredity links
http://www.1sus.edu/sc/bios/106web.htm