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

question 15

Multiple Choice

Hypophosphatemia (vitamin D-resistant rickets) is inherited as a 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.

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