Part One
Go to Mrs. O’s website, go to the Unit 4 tab, and click on Pedigree Link #1
A. What kinds of information are found on a pedigree chart?
B. Draw the symbol that represents a male.
C. Draw the symbol that represents a female.
D. What does a line in between two individuals represent?
E. How is an individual that is affected by the trait shown? (draw a picture)
F. What is a generation? How many generations are depicted in the pedigree at the bottom of the page?
G. Look at the top pedigree. How many children does that couple have? What are there genders of the
children?
H. Look at the bottom pedigree. How many children does the original couple have? Are any of these
children affected individuals? Explain.
I. In the bottom pedigree, in the fourth generation, list the gender of each child from oldest to youngest.
Part Two- Twilight Pedigree
A. Draw a pedigree chart for the following family. Carlisle and Esme are grandparents. They have 3
children, Alice, Rosalie, and Edward. Alice is married to Jasper and they have a daughter named Leah.
Rosalie is married to Emmett and they have 3 children, Victoria, Charlie, and Jacob. Edward is married to
Bella and has 2 daughters, Renesme and Jane.
Be sure that you use the appropriate symbols, label the different generations
properly, and include the correct name and gender.
Part Three
Go to back Mrs. O’s website, go to the Unit 4 tab, and click on Pedigree Link #2
A. What is the main cause of Hemochromatosis?
B. How is Hemochromatosis inherited? Is it a recessive or dominant disorder?
C. If a woman is heterozygous for Hemochromatosis and the man HAS Hemochromatosis (recessive
disorder), what chance do their children will have the disorder? Draw a Punnett Square and indicate the
possible outcome (phenotypes and percentages)
Part Four
Now use the information that you learned about Hemochromatosis to complete your pedigree chart from
Part Two of this lesson.
A. Indicate that Carlisle, Rosalie, Jacob, Jasper and Edward HAVE Hemochromatosis by shading in the
symbols that represent them in the Pedigree Chart.
B. Describe which parent gave Jacob the defective allele for Hemochromatosis and explain how you know.
C. Go back to your Pedigree drawing and label each family members genotype. (Use the letter H/h)