Biology
Reading a Pedigree Worksheet
Name
Date
Period
Use the pedigree on the reverse of this page to answer the following questions.
1. (1) What does it mean to say that Queen Victoria is a “carrier” of hemophilia?
2. (1) Hemophilia is a (dominant/ recessive), (autosomal/ sex-linked) trait . (circle correct
choices.)
3. (1) How many children did Queen Victoria and Prince Albert have?
4. (1) How many royal people eventually inherited hemophilia? (Note: carriers DO NOT have the
disease!)
5. (2) Leopold (son of Queen Victoria and Prince Albert) has hemophilia, but none of his
children do. Explain why this is so.
6. (1) Which sons have hemophilia from the marriage of Beatrice to Henry of Battenburg?
7. (1) In the children of Alice of Hess & Louis IV, how many sons have hemophilia?
How many daughters are carriers?
8. (2)Victoria Eugenie is a carrier of the disorder. She married Alfonso of Spain, who does not
have the disorder. Three of the four sons from this marriage are hemophiliacs. According to
the laws of probability, what percentage of their sons would most probably have inherited the
disorder? What percentage of all their children would most probably have the disorder? (Hint:
use a Punnett square to figure out the probabilities!)
9. (4) Name all the carriers of hemophilia. What is their sex?
10. (2) Is the gene for hemophilia still present in the royal family of Great Britain? Why or why
not?