[Campbell Biology P.987] Based on the top histogram 'Individuals with an inactivating mutati... | Practice Question

Based on the top histogram 'Individuals with an inactivating mutation in one copy of PCSK9 gene' , what is the approximate percentage of individuals in the study group who had plasma LDL cholesterol levels of 100 mg/dL or less?

  • A: Approximately 30%
  • B: Approximately 46%
  • C: Approximately 61%
  • D: Approximately 78%

Explanation

For the study group top histogram , we sum the approximate percentages for LDL levels up to 100 mg/dL: 0-25 mg/dL 5% + 25-50 mg/dL 4% + 50-75 mg/dL 30% + 75-100 mg/dL 22% . Summing these gives 5 + 4 + 30 + 22 = 61%.