The family of queen victoria shows a number of haemophilic descendents as she was the carrier of the diseases. Name the pattern of inheritance of this royal diseases.

According to common Mendelian pattern of inheritance F_1 resembles the dominant parent. But in contrast there are certain other patterns of inheritance In which F_1 , does not resembles either of the parents. Name the pattern of inheritance in which F_1 ,shows a character in between the two parents.