Behavior genetics against genetic determinism?

Gene Expression
By Razib Khan
Apr 20, 2009 5:18 PMNov 5, 2019 9:37 AM

Newsletter

Sign up for our email newsletter for the latest science news
 

Bryan Caplan notes & argues:

If you take a closer look at BG research, though, you'll notice something interesting. Virtually every BG study partitions variance into three sources: genes, shared family environment, and non-shared environment. Typical estimates are something like 40-50% for genes, 0-10% for shared family environment, and 50% for non-shared environment. And what exactly is non-shared environment? Everything other than genes and family environment! ... Nevertheless, I strongly suspect that if non-shared environment's contribution to behavioral variance were a lot smaller, determinists would be heralding the result as "proof" of their position. And if this suspicion is right, it's only fair to ask them to reduce their confidence in light of the findings of BG research.

This seems about right. The only issue I have is that as Caplan notes there isn't really a lot of data on what the unaccounted for "non-shared environment" is. If it's just so much "noise," there are pretty much no policy implications, right? Whereof one does not know, one must do no harm. Related:Environment as the gene's handmaid.

1 free article left
Want More? Get unlimited access for as low as $1.99/month

Already a subscriber?

Register or Log In

1 free articleSubscribe
Discover Magazine Logo
Want more?

Keep reading for as low as $1.99!

Subscribe

Already a subscriber?

Register or Log In

More From Discover
Recommendations From Our Store
Stay Curious
Join
Our List

Sign up for our weekly science updates.

 
Subscribe
To The Magazine

Save up to 40% off the cover price when you subscribe to Discover magazine.

Copyright © 2024 Kalmbach Media Co.