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The following is a partial list of the "G" codes for Medical Subject Headings (MeSH), as defined by the United States National Library of Medicine (NLM).

This list continues the information at List of MeSH codes (G12). Codes following these are found at List of MeSH codes (G14). For other MeSH codes, see List of MeSH codes.

The source for this content is the set of 2006 MeSH Trees from the NLM.

MeSH  G13 – genetic phenomena

MeSH  G13.180 – consanguinity

MeSH  G13.285 – founder effect

MeSH  G13.330 – gene frequency

• MeSH  G13.330.159 – gene flow
• MeSH  G13.330.320 – genetic drift

MeSH  G13.340 – gene order

MeSH  G13.345 – gene pool

MeSH  G13.360 – genetic load

MeSH  G13.370 – genomic instability

• MeSH  G13.370.180 – chromosome instability
• MeSH  G13.370.180.180 – chromosome fragility

MeSH  G13.380 – genotype

• MeSH  G13.380.350 – gene dosage
• MeSH  G13.380.355 – genetic predisposition to disease
• MeSH  G13.380.360 – haplotypes
• MeSH  G13.380.383 – heterozygote
• MeSH  G13.380.554 – homozygote

MeSH  G13.400 – hybrid vigor

MeSH  G13.420 – inheritance patterns

• MeSH  G13.420.040 – anticipation, genetic
• MeSH  G13.420.275 – extrachromosomal inheritance
• MeSH  G13.420.275.500 – genes, mitochondrial
• MeSH  G13.420.320 – genes, dominant
• MeSH  G13.420.325 – genes, recessive
• MeSH  G13.420.457 – genes, x-linked
• MeSH  G13.420.523 – genes, y-linked
• MeSH  G13.420.590 – multifactorial inheritance
• MeSH  G13.420.720 – quantitative trait, heritable

MeSH  G13.540 – linkage (genetics)

• MeSH  G13.540.500 – linkage disequilibrium
• MeSH  G13.540.562 – lod score

MeSH  G13.695 – phenotype

• MeSH  G13.695.450 – genetic markers
• MeSH  G13.695.650 – penetrance

MeSH  G13.697 – phylogeny

MeSH  G13.700 – ploidies

• MeSH  G13.700.131 – aneuploidy
• MeSH  G13.700.131.500 – monosomy
• MeSH  G13.700.131.750 – trisomy
• MeSH  G13.700.264 – diploidy
• MeSH  G13.700.456 – haploidy
• MeSH  G13.700.740 – polyploidy

MeSH  G13.810 – sequence homology

• MeSH  G13.810.200 – sequence homology, amino acid
• MeSH  G13.810.550 – sequence homology, nucleic acid
• MeSH  G13.810.550.830 – synteny

MeSH  G13.815 – sex ratio

MeSH  G13.820 – structural homology, protein

MeSH  G13.920 – variation (genetics)

• MeSH  G13.920.036 – antibody diversity
• MeSH  G13.920.073 – antigenic variation
• MeSH  G13.920.331 – genetic heterogeneity
• MeSH  G13.920.590 – mutation
• MeSH  G13.920.590.029 – allelic imbalance
• MeSH  G13.920.590.029.530 – loss of heterozygosity
• MeSH  G13.920.590.029.530.175 – chromosome deletion
• MeSH  G13.920.590.060 – base pair mismatch
• MeSH  G13.920.590.120 – codon, nonsense
• MeSH  G13.920.590.175 – chromosome aberrations
• MeSH  G13.920.590.175.050 – aneuploidy
• MeSH  G13.920.590.175.050.500 – monosomy
• MeSH  G13.920.590.175.050.750 – trisomy
• MeSH  G13.920.590.175.125 – chimerism
• MeSH  G13.920.590.175.165 – chromosomal instability
• MeSH  G13.920.590.175.165.180 – chromosome fragility
• MeSH  G13.920.590.175.175 – chromosome breakage
• MeSH  G13.920.590.175.177 – chromosome deletion
• MeSH  G13.920.590.175.420 – inversion, chromosome
• MeSH  G13.920.590.175.430 – isochromosomes
• MeSH  G13.920.590.175.570 – micronuclei, chromosome-defective
• MeSH  G13.920.590.175.595 – mosaicism
• MeSH  G13.920.590.175.760 – ring chromosomes
• MeSH  G13.920.590.175.815 – sex chromosome aberrations
• MeSH  G13.920.590.175.815.970 – xyy karyotype
• MeSH  G13.920.590.175.870 – translocation, genetic
• MeSH  G13.920.590.175.870.680 – philadelphia chromosome
• MeSH  G13.920.590.175.935 – uniparental disomy
• MeSH  G13.920.590.220 – dna repeat expansion
• MeSH  G13.920.590.220.865 – trinucleotide repeat expansion
• MeSH  G13.920.590.300 – frameshift mutation
• MeSH  G13.920.590.310 – gene amplification
• MeSH  G13.920.590.320 – gene duplication
• MeSH  G13.920.590.335 – genomic instability
• MeSH  G13.920.590.350 – germline mutation
• MeSH  G13.920.590.650 – mutation, missense
• MeSH  G13.920.590.675 – point mutation
• MeSH  G13.920.590.762 – sequence deletion
• MeSH  G13.920.590.762.180 – chromosome deletion
• MeSH  G13.920.590.762.320 – gene deletion
• MeSH  G13.920.590.835 – suppression, genetic
• MeSH  G13.920.795 – polymorphism, genetic
• MeSH  G13.920.795.595 – polymorphism, restriction fragment length
• MeSH  G13.920.795.600 – polymorphism, single-stranded conformational
• MeSH  G13.920.795.800 – polymorphism, single nucleotide

The list continues at List of MeSH codes (G14).