A four-generation pedigree of 29 people, modeled on Queen Victoria’s family: a carrier woman, I-2, has an affected son, II-4, and two carrier daughters, II-3 and II-6. Every affected person is a man, seven in all across generations II to IV, and six of them are marked deceased. Carrier women are drawn half filled, the arrow marks the proband, IV-5, and the key below explains every symbol.