Queen Victoria of England had a son,Leopold,and a great-grandson,Tsarevich Alexei Nikolaevich Romanov of Russia,who had hemophilia.We can conclude that:

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Queen Victoria was a carrier for hemophilia, meaning she had one functional and one defective copy of the gene. She passed on the defective copy to her son Leopold, who then passed it on to his daughter, who became a carrier like her grandmother. When Leopold's daughter married into the Russian royal family, she passed on the defective gene to her son, Tsarevich Alexei, who developed hemophilia.

Queen Victoria of England Had a Son,Leopold,and a Great-Grandson,Tsarevich Alexei