Study dissected the genetic nature of hair colors concluding that red hair accounts for ~90% of the SNP heritability whereas black through dark and light brown to blonde account for 73% of the SNP heritability of blonde hair. User Science_Podcast, in the Biology subreddit, 27 Dec 2018
Genome-wide study of hair colour in UK Biobank explains most of the SNP heritability User enilkcals, in the Genetics, genes, and genomes subreddit, 11 Dec 2018