+[TODO: association studies "trained" on one population don't perform as well against a "test set" from another population]
+
+[frequencies of SNPs for schizophrenia correlate well for subpops on the same continent (p. 187–8)]
+
+[table p. 192]
+
+[sickle-cell, lactase persistence]
+
+[Tibet, Peru, Ethiopia all have high-altitude adapatations, but they're different adaptations, p. 198]
+
+The third part of the book is about genetic influences on class structure!
+
+[p. 212-4: A + C + E model and comparing identical and fraternal twins (different from twins raised apart)]
+[ACE model assumes no assortative mating, which leads to an underestimate of A: because it makes fraternal twins resemble each other for non-environmental reasons]
+[equal environments assumption could be violated]
+
+[shared environment is zero for personality]
+
+[standard examples:red haired children, plants with sunshine]
+
+[parental SES also tracks parental genes]
+
+[not determinism for individuals, but shapes class structure]
+
+[useful outside interventions are hard]
+
+[last section looks ahead]
+
+[geneticists used to think that they would find small number of "genes for" something, but it turns out that lots of SNPs (omnigenetic) affect lots of things (pleiotropy)]
+
+[vertical pleiotropy: LDL affects heart attack; vs. horizontal]
+
+["tag" SNP: https://www.gwern.net/Embryo-selection#limits-to-iterated-selection-the-paradox-of-polygenicity ]
+
+[Plomin school vs. Turkheimer school debate on the usefulness of polygenic scores]
+
+[Plomin says, causal in one direction (trait can't cause score), predict from brith, predict individuals. Can assess risk before it happens, clinical psychology will move towards dimensions rather than diagnoses, "positive genomics"—looking at the right tail in contrast to clinical psychology's focus on disorders]
+
+[Eric Turkheimer: polygenic scores don't tell you anything about causality, and science is about causes: heritability without mechanism. Divorce is heritable _in the same way_ that IQ is. http://www.geneticshumanagency.org/gha/the-ubiquity-problem-for-group-differences-in-behavior/ a "universal, nonspecific genetic pull on everything"]