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USMLE – United States Medical Licensing Examination

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Showing 7–9 of 20 questions

Question 7

A couple comes for preconceptional genetic counseling because they both have a family history of α-thalassemia. The woman has a minimally decreased hemoglobin concentration. Genetic studies show a single gene deletion. The man has microcytic anemia and a two-gene deletion. If the two-gene deletion is in trans (one deletion on the maternal gene and one deletion on the paternal gene), which of the following percentages of their offspring will have a two-gene deletion?

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  • ○

    0%
  • ○

    25%
  • ○

    50%
  • ○

    75%
  • ○

    100%
Question 8

Normal values for HCO3 are considered:

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  • ○

    15-30 mEq/L
  • ○

    20-35 mEq/L
  • ○

    22-26 mEq/L
  • ○

    24-29 mEq/L
Question 9

Which of the following is caused by a B5 deficiency?

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  • ○

    Ectopic pregnancy
  • ○

    Nausea
  • ○

    Dermatitis
  • ○

    Fever