The family pedigree chart of Queen Victoria shows that many of her

The family pedigree chart of Queen Victoria shows a number of haemophilic males among her descendants as she was a carrier of the disease. Haemophilia is an X-linked recessive disease, which shows its transmission from unaffected carrier female to half of the male progeny. The possibility of a female becoming a haemophilic is extremely rare because mother of such a female has to be at least carrier and the father should be haemophilic (unviable in the later stage of life).