Enviornment or Genes

Jim Lewis and clerical worker Jim Springer, Identical twins separated five weeks after birth, they were raised by families 80 miles apart in Ohio. Reunited 39 years later, they would have strained the credulity of the editors of Ripley=s Believe it or Not. Not only did both have dark hair, stand six feet tall and weigh 180 pounds, but they spoke with the same inflections, moved with the gait and made the gestures. Both loved stock car racing and hated baseball. Both married women named Linda, divorced them and married women named Betty. Both drove Chevrolets, drank Miller light, chain-smoked Salem's and vacationed on the same half-mile stretch of Florida beach. Both had elevated blood pressure, severe migraines and had undergone vasectomies. Both hit their nails. Their heart rates, brain waves and IQ's were nearly identical. Their scores on personality tests were as close as if one person had taken the same test twice. ... Studies of twins have produced an impressive list of attributes or behaviours that appear to owe at least as much to heredity as to environment. It includes alienation. Extroversions, traditionalism, leadership, career choice, risk aversion, attention deficit disorder, religious conviction and vulnerability to stress. one study even concluded that happiness is 80 percent heritable C it depends little on wealth, achievement or marital status. Another study found that while both optimism and pessimism are heavily influenced by genes, environment affects optimism but not pessimism