Hypophosphatemia (Vitamin D-Resistant Rickets)is Inherited as an Sex-Linked Dominant Trait

question 29

Multiple Choice

Hypophosphatemia (vitamin D-resistant rickets) is inherited as an sex-linked dominant trait.The relevant gene is found on the X chromosome.What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia?

• A) All of their daughters and none of their sons exhibit hypophosphatemia.
• B) Fifty percent of their daughters and fifty percent of their sons exhibit hypophosphatemia.
• C) All of their sons and none of their daughters exhibit hypophosphatemia.
• D) Twenty-five percent of their offspring exhibit hypophosphatemia.