Interaction of Heredity and Environment

AP Psychology· difficulty 4/5

The MZ-versus-DZ pattern shown most strongly suggests:

A
$No genetic influence on any trait$
B
$A genetic component to all three traits$
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C
$Identical twin pairs share less than fraternal pairs$
D
$Environment alone explains the differences$

Explanation

For each trait, monozygotic (genetically identical) twins show substantially higher concordance than dizygotic (~50% genetic) twins—a pattern indicating meaningful genetic influence.

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