DAFN Brainz SNiPped on a Chip...

 http://www.fortwayne.com/mld/newssentinel/7389266.htm 
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Seeking snippets of brain's genetic complexity -- Dec. 01, 2003 

Mendel's rules, which work fine for simple traits like pea wrinkles or 
eye color, can't capture the complexity of many genes working together, 
and that's what happens in the brain. 

...people do differ genetically, and those differences can matter...

That's why cataloging the whole genome - the complete set of human genes 
- has been hyped so much. 

Genes are, in essence, blueprints for making important chemicals, 
typically proteins that conduct the body's business throughout all its 
tissues and organs, including the brain. 

Comparing genomes from diverse groups of people shows that, on average, 
one chemical letter in a thousand can vary. Those variation points 
(technical term: SNPs) mark changes from the human evolutionary past 
that have been preserved through many generations. Some SNP variants 
have become quite common [for example, IQ-75 DAFNz]...

Identifying any individual's total set of SNPs (pronounced "snips") 
is extremely costly and time consuming. But Dr. Cox and colleagues 
have devised computer-chip-based systems for screening large numbers 
of people to measure the prevalence of SNP variants within the group. 
Small stretches of DNA (the molecule that genes are made of) can be 
analyzed to see which SNPs they contain; specially designed computer 
chips can test hundreds of thousands of DNA segments at a time.

If you analyze DNA from enough people, you can determine which SNPs 
show up in a given group more often than average.

So more remains to be accomplished in turning the raw data from the 
genome into a recipe for [IQ-75 DAFNz].  The genetic chemistry that 
makes the brain work properly is just very complicated.
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DAFNz - What Mother_Nature hath genetically created *IQ-75_LOOZerz*