Chapter 2

Interactions between nature and nurture:
   Heritability estimates: calculate how much is due to genetic factors.
      Use twin and adoption studies

   IQ: correlation between children and biological parents increases with age
         correlation between children and adoptive parents decreases with age
             Environment plays a very important role early in life

   May think of biology as defining the range of potential and of environment as fulfilling this potential
   Range of reactions: genes may define an optimal range of interests and abilities
                                the kind of environment has to fit with biological predispositions

   Canalization: tendency of heredity to restrict development to only a few outcomes; same with environment

   Genetic-environmental correlation: genes influence the environments we're exposed to
      Passive correlation: have no control over it
      Evocative correlation: children evoke responses from others
      Active correlation: pick environment that matches personal tendencies