Final answer:
The probability that individual VI-1 would suffer from the disease in question is 50%.
Step-by-step explanation:
The probability that individual VI-1 would suffer from the disease in question is 50%. According to Mendelian genetics, if the mother is a carrier of an X-linked recessive disorder and the father is normal, there is a 50% chance that a son will be affected by the disorder. Daughters, on the other hand, would either be carriers or unaffected by the disorder.