CK-12 Foundation
Ck 12: Life Science: 3.13 Sex Linked Inheritance
Learn about the traits that are linked to genes on the sex chromosomes.
BiologyWise
Biology Wise: Dominant and Recessive Traits in Humans
Explains what dominant and recessive traits are and how they work, and provides a list of single gene traits with the degree of manifestation if they are dominant or recessive. Also discusses co-dominance, incomplete dominance, polygenic...
PBS
Pbs: Our Genes/our Choices: The Probabilities of Problems: A Look at Inheritance
Learn how the genes inherited from two parents can be recombined in their offspring in this simulation activity. In addition, investigate the probabilities of passing on inherited genetic disorders.
Other
North Dakota State Univ.: Detecting and Measuring Linkage
A good site to establish what is meant by gene linkage and sex-linkage.