A family has a history of genetic disease with an autosomal dominant pattern of inheritance. DNA from the grandfather (who is heterozygous for the disease) is cloned and used to construct a restriction map of the gene region involved in the disease. He has a restriction site polymorphism at EcoHV site 2 (HV-2), which is useful as a marker. His abnormal chromosome lacks the HV-2 site. DNA from his affected grandson is digested with EcoHV, Southern blotted, and probed with 32P-cDNA complementary to exon 2. Which of the following options most likely represents the restriction fragment length polymorphism (RFLP) pattern obtained from the affected grandson?
- A)BGABARITO
- B)D
- C)C
- D)E
- E)A
Explicação
The correct answer is B. Source: Kaplan USMLE Step 1 QBank — Biochemistry Test 1. Ver explicação completa e trilha adaptativa →