Medical School MD + DO Mastery

A 4-year, board-aligned study system for medical school and licensing exams.

Walk the full Year 1–4 curriculum — foundational sciences, organ-system blocks, clinical clerkships and advanced practice — each with mastery checklists and linked learning resources, plus a dedicated review system for school exams, Shelf/COMAT, USMLE Step 1–3 and COMLEX-USA Levels 1–3.

GENETICS + MOLECULAR BIOLOGY

YEAR 1 | PAGE 42C - DNA -> RNA -> PROTEIN -> INHERITANCE -> DIAGNOSTIC TEST

MECHANISM CHAIN: DNA ORGANIZATION -> REPLICATION/REPAIR -> TRANSCRIPTION/PROCESSING -> TRANSLATION -> MUTATION -> INHERITANCE -> PHENOTYPE -> TEST SELECTION. DO NOT START WITH THE DISEASE NAME. G. MOLECULAR / GENETICS REVIEW MAP

AreaCore retrievalHigh-discrimination task
Replication + repairLeading/lagging logic; polymerases; proofreading; telomeres; mismatch, nucleotide-excision, base-excision and double-strand repair concepts.Predict mutation consequence from the failed step; keep 5'/3' directionality explicit.
Transcription + RNA processingPromoter/transcription factors; RNA polymerases; 5' cap, poly-A tail, splicing; regulatory logic.Distinguish coding vs template strand and predict effects of altered splicing/regulation.
Translation + protein processing InheritanceGenetic code; tRNA charging; ribosome; initiation/elongation/termination; post-translational targeting. AD/AR/X-linked/mitochondrial; penetrance; expressivity; anticipation; mosaicism; heterogeneity; imprinting/UPD.Move from DNA/RNA change to amino-acid/protein consequence. Solve recurrence probability from the pedigree rather than recognizing a memorized disease.
Molecular diagnosticsKaryotype; FISH; microarray; PCR; sequencing; repeat-expansion tests; conceptual blot logic.Choose the test that can detect the lesion size/type being sought.

MECHANISM CHAIN: DNA ORGANIZATION -> REPLICATION/REPAIR -> TRANSCRIPTION/PROCESSING -> TRANSLATION -> MUTATION -> INHERITANCE -> PHENOTYPE -> TEST SELECTION. DO NOT START WITH THE DISEASE NAME. G. MOLECULAR / GENETICS REVIEW MAP — H. DEEP REVIEW RESOURCES - DIRECT & PLAYABLE

DNA Replication - Ninja Nerd - origins, helicase, primase, polymerases, leading/lagging strands, proofreading and telomeres. Translation: Protein Synthesis - Ninja Nerd - genetic code, tRNA, ribosome and initiation/elongation/termination. Inheritance Patterns - Osmosis - autosomal, X-linked and mitochondrial pedigree logic. Karyotyping - Osmosis - aneuploidy and structural chromosome abnormalities; what karyotype can and cannot detect.

MECHANISM CHAIN: DNA ORGANIZATION -> REPLICATION/REPAIR -> TRANSCRIPTION/PROCESSING -> TRANSLATION -> MUTATION -> INHERITANCE -> PHENOTYPE -> TEST SELECTION. DO NOT START WITH THE DISEASE NAME. G. MOLECULAR / GENETICS REVIEW MAP — I. TOP 10 MOST-MISSED FOUNDATIONAL CONCEPTS - #6 TO #8 6. Directionality is a reasoning tool, not a detail to memorize Deep explanation

Replication, transcription and translation become coherent when every strand and product is oriented. Enzymes read and synthesize in defined directions; many mutations and technique questions depend on that geometry.

MECHANISM CHAIN: DNA ORGANIZATION -> REPLICATION/REPAIR -> TRANSCRIPTION/PROCESSING -> TRANSLATION -> MUTATION -> INHERITANCE -> PHENOTYPE -> TEST SELECTION. DO NOT START WITH THE DISEASE NAME. G. MOLECULAR / GENETICS REVIEW MAP — I. TOP 10 MOST-MISSED FOUNDATIONAL CONCEPTS - #6 TO #8 6. Directionality is a reasoning tool, not a detail to memorize Deep explanation

ResourceDescriptionLink
Why learners miss itLearners memorize enzyme names but omit strand orientation, then reverse template/coding or leading/lagging logic.

MECHANISM CHAIN: DNA ORGANIZATION -> REPLICATION/REPAIR -> TRANSCRIPTION/PROCESSING -> TRANSLATION -> MUTATION -> INHERITANCE -> PHENOTYPE -> TEST SELECTION. DO NOT START WITH THE DISEASE NAME. G. MOLECULAR / GENETICS REVIEW MAP — I. TOP 10 MOST-MISSED FOUNDATIONAL CONCEPTS - #6 TO #8 6. Directionality is a reasoning tool, not a detail to memorize Deep explanation

Easiest clueWrite 5' and 3' before solving. Orientation prevents many avoidable molecular errors.
7. Inheritance questions are probability problems under a biological model Deep explanationFirst infer the transmission model from sex distribution, affected generations and parent-to-child pattern. Then calculate risk, and only afterward incorporate penetrance, mosaicism, anticipation or imprinting.
Why learners miss it Easiest clueRecognizing a disease association can override the actual pedigree evidence. Pattern -> genotype -> probability. Disease name is optional if the pedigree model is correct.
8. Genetic test selection depends on lesion scale and mechanism Deep explanationLarge chromosome abnormalities, targeted loci, copy-number changes, sequence variants and repeat expansions are different problem classes. A test is useful only if its resolution and method can detect the suspected lesion.
Why learners miss it Easiest clueStudents memorize test names independently and pick the most sophisticated-sounding option. Ask what physical change you are trying to see. Size/type of lesion chooses the method.
2026/27 foundational-review expanded edition - verify school and official exam updates before testing