A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their daughter have the normal number of digits (five fingers on each hand and five toes on each foot.) Having extra digits is a dominant trait. The couple's second child has extra digits. What is the probability that their next (third) child will have extra digits? (A) 1 / 2 (B) 1 / 16 (C) 1 / 8 (D) 3 / 4

Polydactyly is a condition in which a person has additional fingers. It is a genetic disorder that the parents can pass on to the children. The thumb finger, middle finger, and little finger are the digits most commonly affected by this illness.

In the given situation it is mentioned that suffering from polydactyly is a dominant trait which is present in father.The mother is in normal condition, while the father has six fingers and six toes. Since the father retains the dominant trait and the mother is in normal state, there is a 50% chance that this deformity will be passed to the children. Hence, the probability of suffering from polydactyly in their child will be the fraction of 1/2.

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