Which of the following is the most likely inheritance pattern in the pedigree given below –

It is an X-linked dominant pattern of inheritance. The features which suggest the X-linked dominant pattern of inheritance are- A single abnormal X chromosome is sufficient to express the disease. All of the female offsprings of a diseased male XY will receive the abnormal X chromosome and express the disease, whereas none of the male offspring to the deceased father will have the disease (as sons don't receive X chromosome from their father). A diseased mother can transmit the abnormal X chromosome to both daughter and sons equally.