<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 28-year-old woman, gravida 1, para 0, at 20 weeks gestation comes to the physician for genetic counseling. Her brother and maternal uncle both have anemia that worsens after taking certain medications. Based on the pedigree shown, what is the probability that her son will be affected by the disease?? A: 25, B: 0, C: 100, D: 12.5, E: 50n,  <response>: This is a question about calculating risk based on a pedigree. The pedigree shows an X-linked recessive pattern of inheritance, with affected males on the maternal side. Since the disease is X-linked recessive, there is a 50 chance that the fetus is male. If male, there is a 50 chance of inheriting the abnormal X chromosome from the mother. Therefore, the probability that the son will be affected is 25 50 x 50.A: 25 