Tom's father has hemophilia, but Tom does not have the disease. What are the chances that Tom's children will have hemophilia?
a. Tom's sons will almost certainly have it because Tom will have inherited the recessive gene from this father.
b. Tom's daughters may be carriers, but his sons will not have the gene.
c. All of Tom's children will be carriers, but it will not be expressed until they have children.
d. None of Tom's children will be carriers or have the illness because his X gene came from his mother, who is not a carrier.
Question 2
Queen Victoria of England had a son, Leopold, and a great-grandson, Tsarevich Alexei Nikolaevich Romanov of Russia, both of whom had hemophilia. We can conclude that:
a. Queen Victoria must have had hemophilia, too.
b. Queen Victoria was a carrier for hemophilia.
c. Queen Victoria's husband, Prince Albert, must have been a carrier.
d. Leopold and Tsarevich Alexei probably developed hemophilia due to a spontaneous mutation, because their female relatives did not have the condition.
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