USMLE USMLE Exam
United States Medical Licensing Examination (Page 7 )

Updated On: 7-Feb-2026

Which of the following is the approximate prevalence ratio for cystic fibrosis?

  1. 1: 25,000
  2. 1: 5,000
  3. 1: 2,000
  4. 1: 800

Answer(s): C



Which of the following divisions of cell growth precedes Mitosis in the cell cycle?

  1. G
  2. G
  3. S
  4. G0

Answer(s): A



Down syndrome is directly linked to a genetic abnormality of chromosome?

  1. XXII
  2. XXI
  3. XIIX
  4. XV

Answer(s): B



Which of the following is a characteristic of the Hardy-Weinberg law?

  1. Mating between species occurs at a set rate.
  2. Migration is a considerable factor.
  3. Mutation occurs at the locus
  4. Genotype selection does not occur at the locus

Answer(s): D



Which of the following is not a characteristic of Hurler's syndrome?

  1. Autosomal recessive condition
  2. Associated with delayed mental development
  3. Spasticity
  4. Corneal deficits

Answer(s): C






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