You are measuring the trait of friendliness in a set of 100 fraternal twins. You notice that for almost all of the twins, when one is high on this measure,

You are measuring the trait of friendliness in a set of 100 fraternal twins. You notice that for almost all of the twins, when one is high on this measure, the other twin may be high or low. We would say that the trait of friendliness has
A) high heritability
B) low selection pressure
C) high selection pressure
D) high concordance
E) low concordance


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