Identical Twins Show a Close Resemblance in IQ-Test Performance

question 36

Essay

Identical twins show a close resemblance in IQ-test performance (+.86), whereas the resemblance in IQ among fraternal twins is moderate (+.60). Are these findings consistent with the behavioral genetic proposition that shared environmental influences contribute very little to the development of personality? Explain.

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Definitions:

School-Age Child

A child typically between the ages of 6 and 12, who is undergoing significant physical, emotional, and cognitive development.

Pinna

The outer part of the ear, made of cartilage and skin, that helps to collect and direct sound waves into the ear canal.

Babinski Sign

A reflex indicated by upward movement of the big toe when the sole of the foot is stimulated, used to assess neurological function.

Disappear

To vanish or go out of sight; in medical terms, it could refer to the resolution of symptoms or findings.