“Hamer noticed a correlation: the people with more copies of the mini satellite- more stutters- exhibited a greater desire for novelty… It was one of the first studies linking a personality trait to a specified genetic state….In the coming decades, there will be a monumental leap in our knowledge of the genetic location of inherited diseases. And more and more genes will be discovered that link behavior to the chemicals in our brains, and genes tied to our urges and emotions” -Weinberg p 349-350
I think that if Weinberg were to comment on her speculation today, almost 15 years after the publication of her book, she would say genetic disease typing is moving a lot slower than she thought. I myself might just be out of the loop, but I feel like there have not been any major leaps forward in the field that studies genetic links to our personalities.
On the other hand, a 2012 article describing a study done by British researchers asserts that nature (genes) play more of a role in our personalities than nurture does, supposedly providing an answer to the nature vs. nurture debate. The study showed that identical twins were twice more likely to share personality traits than non-identical twins, who do not have identical DNA. The researchers focused on personality traits such as perseverance and self-control, and showed that there was the biggest genetic difference in these types of traits, i.e. the ability to keep going when things got hard. The researchers were less focused on individual talent, and more about what drove that talent.
I think that this is a very interesting and diverse field, with plenty of room for several applications and a great potential to make people’s lives better by understanding and diagnosing their conditions efficiently. But I also think it leaves a lot of room for ambiguity, particularly where what doctors diagnose as psychological conditions intermingle with what would now be known to be genetic predisposition. I also think that people might have more excuses for their behavior, now that they could blame their actions on DNA, or almost like instinct, as if they were forced to do something. But I think the biggest issue comes from what Weinberg was afraid of, completely knowing what every trait and gene in our body do and having a map of them. I think this is a ethical dilemma, and further research in this area would be open to ethical scrutiny of not done carefully.