USMLE Step 1
Genetics Practice Questions — USMLE Step 1
Inheritance patterns, chromosomal disorders, and molecular genetics — from Mendelian to population genetics.
Start Practicing — FreeWhat you'll practice
Mendelian inheritance — autosomal dominant/recessive, X-linked
Chromosomal disorders — trisomies, deletions, translocations
Imprinting & uniparental disomy
DNA repair disorders
Population genetics — Hardy-Weinberg
Mitochondrial inheritance
Molecular techniques — PCR, FISH, karyotype
Multifactorial & polygenic disorders
How our adaptive system works
Targets your weak areas
After each answer, questions are selected from the categories where your accuracy is lowest — so you spend time where it counts.
Avoids recent repeats
The last 20 questions you answered are excluded, so you're never stuck in a loop on the same material.
Detailed explanations
Every answer choice gets its own explanation — not just why the right answer is correct, but why each wrong answer is wrong.
Track by category
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