NATURE VIA NURTURE - genes, experience, and what makes us human
http://www.amazon.com/exec/obidos/tg/detail/-/006000679X/qid=1093711993/
- INTELLIGENCE
Despite the sweeping successes of twin studies, a few features of
human behavior prove to be less heritable. The sense of humor shows
low heritability: adopted siblings seem to have quite similar senses
of humor, while separated twins have rather different ones. People's
food preferences seem to be barely heritable-you get your food
preferences from your early experience, not your genes (so do rats).
Social and political attitudes show a strong influence from the shared
environment-liberal or conservative parents seem to be able to pass on
their preferences to their children. Religious affiliation, too, is
passed on culturally, rather than genetically, though not religious
fervor.
What about intelligence? The debate about the heritability of IQ has
been scarred by controversy since its inception. The first IQ tests
were crude and culturally biased. In the 1920s, convinced that
intelligence...