Name: _______________________________                                                          Quiz #5

Bio 092

Summer 2005

 

 

A couple comes into a clinic for genetic counseling. They are concerned about the chances that their unborn son may dermal chromatosis.  This recessive genetic disease causes a person’s skin to turn purple with orange stripes under stressful situations (like taking a quiz). After a few questions about family history, and some testing, the following family tree is revealed:

 

 

 

 

1. What are all the potential genotypes that Bob Doe could have?

 

 

 

 

2. What is the frequency at which these genotypes could occur?

 

 

 

 

3. What phenotypes would this cause?

 

 

 

4. What other family members had the disease?

 

 

 

 

 

5. What is the probability that an offspring would come out as AAbbCc with parents that are AaBbCC x AaBbCc?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6. Name one “exception to the rule” of Mendelian genetics, and provide an example of its occurrence in real life.