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genetics-expert

Expert-level genetics covering Mendelian inheritance, molecular genetics, mutations, linkage analysis, population genetics, epigenetics, and GWAS. Covers classical and modern approaches from Mendel to CRISPR.

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Genetics Expert

Before Starting

  1. Classical or molecular genetics focus?
  2. Human genetics or model organisms?
  3. Research or clinical context?

Core Expertise Areas

Mendelian Genetics

Law of Segregation: alleles separate during gamete formation. Law of Independent Assortment: genes on different chromosomes assort independently. Dominance patterns: complete, incomplete, codominance. Epistasis: gene interaction modifying phenotypic ratios. Penetrance and expressivity: not all genotypes produce expected phenotype.

Molecular Genetics

DNA replication: semi-conservative, leading/lagging strand synthesis. Transcription: promoters, enhancers, RNA polymerase, splicing. Translation: codons, tRNA, ribosome, start/stop signals. Gene regulation: operons (prokaryotes), transcription factors (eukaryotes). Epigenetics: DNA methylation, histone modification, chromatin remodeling.

Mutation and Repair

Point mutations: missense, nonsense, silent, frameshift. Chromosomal mutations: deletion, duplication, inversion, translocation. DNA repair mechanisms: BER, NER, MMR, DSBR. Mutagens: chemical, radiation, biological.

Linkage and Mapping

Genetic linkage: genes on same chromosome tend to inherit together. Recombination frequency: measure of map distance in centimorgans. Genetic maps vs physical maps. LOD score analysis for linkage detection.

Population Genetics

Hardy-Weinberg equilibrium: p2 + 2pq + q2 = 1. Deviations: mutation, selection, drift, migration, non-random mating. Genetic drift: founder effect, bottleneck effect. Natural selection: directional, stabilizing, disruptive.

GWAS and Complex Traits

Genome-wide association studies: SNPs, Manhattan plots, p-value thresholds. Polygenic traits: multiple loci each with small effect. Heritability: proportion of phenotypic variance due to genetic factors. Linkage disequilibrium: non-random association of alleles at nearby loci.

Key Patterns

Best Practices

  • Always define dominance relationships before solving problems
  • Use Punnett squares for simple crosses, probability for complex
  • Check Hardy-Weinberg assumptions before applying equilibrium
  • Distinguish between genotype and phenotype clearly
  • Consider both nuclear and mitochondrial/chloroplast inheritance

Common Pitfalls

PitfallFix
Confusing penetrance with expressivityPenetrance is all-or-nothing, expressivity is degree
Ignoring epistasisCheck for modified ratios in dihybrid crosses
Applying H-W to non-equilibrium populationsVerify all 5 conditions first
Confusing cM with physical distanceRecombination frequency is not linear at large distances

Related Skills

  • molecular-biology-expert
  • genomics-expert
  • evolutionary-biology-expert
  • bioinformatics-expert

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