Pedigree Links

A Pedigree of Hemophilia in the Royal Families of Europe: A pedigree and links to additional sources of information.

Pedigree of an X-Linked Recessive Trait - Colorblindness: Information and a pedigree. Use the link to test yourself for colorblindness.

Which parent determines the sex of the child?

Which chromosome has hundreds of genes... X  or  Y  ?

Which sex experiences color blindness more frequently... male  or  female  ?

Great explanation - get ready for some sex-linked genetics problems on your next test.

Why is it very, very rare (more rare than color blindness) for females to be hemophiliacs or have Duchenne's muscular dystrophy? 

Please remember these three genetic disorders associated with sex-linked genes. 

Be able to match the disease symptoms with the genetic disorder. 

X Inactivation in Humans

Which sex has a Barr body in each nuclei?

What is the Barr body?

What sex are Calico cats?

The Use of Pedigree Charts to Determine Possible Genotypes

What's an autosome?

How many autosomes do you have?

Good review. I'll probably give you a couple of test questions to see if you can figure out if the disorder being inherited is: sex-linked (X-linked), autosomal dominant, or autosomal recessive.    (I'm not messing with the Y-linked disorders)

Pedigree Chart: Problem Review

Good summary. Pay attention, maybe some of you will become genetic counselors in the future :-)