Multiple choice

Mr. X is found to be homozygous for the e4 allele at ApoE. Which of the following statements regarding his risk of Alzheimer disease is true?

  1. He will almost certainly develop Alzheimer disease.

  2. He is protected from Alzheimer disease.

  3. He is at increased risk of Alzheimer disease.

  4. This result has no bearing on his risk of Alzheimer disease.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The e4 allele is associated with an increased relative risk of Alzheimer disease, but it is not diagnostic.