THE GENOME BY OTHER THAN BREEDING IS VERY DIFFICULT – AND A LOT LESS FUN —-The

http://marginalrevolution.com/marginalrevolution/2015/05/dont-fear-crispr-babies-2.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+marginalrevolution%2Ffeed+%28Marginal+Revolution%29#sthash.BoxnDvpg.dpufALTERING THE GENOME BY OTHER THAN BREEDING IS VERY DIFFICULT – AND A LOT LESS FUN

—-The largest ever survey of genes associated with IQ found 69 separate genes, which together accounted for less than 8% of the variance in IQ scores, implying that at least hundreds of genes, if not thousands, involved in IQ. (See paper, here.) As Nature reported, even the three genes with the largest individual impact added up to less than two points of IQ:

The three variants the researchers identified were each responsible for an average of 0.3 points on an IQ test. … That means that a person with two copies of each variant would score 1.8 points higher on an intelligence test than a person with none of them.—-

http://www.pnas.org/content/111/38/13790.full.pdf