Does anyone remember the Star Trek episode where aliens create a convincing duplicate of Lincoln, and Kirk really went overboard in his hero worship of him? Classic Roddenberry mixed in with some Brady Bunch saccharine!

Interesting abstract: 
 
Relationship of melanin degradation products to actual melanin content: application to human hair 
 
Methods not only for characterizing but also for quantitating melanin subtypes from the two types of melanin found in hair–eumelanin and pheomelanin–have been established. In relation to testing for drugs of abuse in hair, these methods will allow for correction of drug binding to specific melanin subtypes and will serve to improve drug measurement in hair. 5,6-Dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) make up the majority of the eumelanin polymer while benzothiazene units derived from 2-cysteinyl-S-Dopa (2-CysDopa) and 5-cysteinyl-S-Dopa (5-CysDopa) compose the majority of the pheomelanin polymer. Our results show that: (1) pyrrole-2,3-dicarboxylic acid (PDCA) and pyrrole-2,3,5-tricarboxylic acid (PTCA), markers for DHI and DHICA units, respectively, are produced in 0.37 and 4.8% yields, respectively, when melanins are subjected to alkaline hydrogen peroxide degradation, (2) 3-aminotyrosine (3AT) and 4-amino-3-hydroxyphenylalanine (AHP), markers for 2-CysDopa and 5-CysDopa, respectively, are produced in 16 and 23% yield, respectively, when subjected to hydriodic acid hydrolysis, and (3) that black human hair contains approximately 99% eumelanin and 1% pheomelanin, brown and blond hair contain 95% eumelanin and 5% pheomelanin; and red hair contains 67% eumelanin and 33% pheomelanin. These data will allow deeper investigation into the relationship between melanin composition and drug incorporation into hair. 
 
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11180945&dopt=Abstract

Redheads tend to have a great amount of pheomelanin, but almost no eumelanin. Ash blonde people are the reverse, while golden blonde individuals tend to be somewhere in the middle. 
 
If Ash blondes were the reverse of redheads (i.e. high levels of eumelanin and almost no pheomelanin) then wouldn’t they have black hair?

Does this mean that the tendency to form cultures is genetic?