This stacked bar chart shows the frequency of the three genotypes at SNP rs1815739 — the ACTN3 “sprint/power gene” variant — across 21 ancient/modern reference populations from the AADR v66 dataset (n=889 total samples). CC (teal) is the ancestral, fully-functional allele linked to fast-twitch muscle performance; TT (pink) is the loss-of-function variant more common in endurance-oriented phenotypes; CT (orange) is heterozygous. Sample sizes per population are shown at the top.
📊Results:
Yoruba has the highest CC frequency (75%), while Uyghur, Telugu, and Sindhi/Pakistani skew heavily toward CT/TT, with Uyghur showing almost no CC (8%) — consistent with known geographic clines in ACTN3 allele frequency (roughly higher CC/R-allele frequency in African populations, higher TT/X-allele frequency in East/South Asian populations).
