The strongest support for heredity’s influence on intelligenceis the finding thata. identical twins, but not other siblings, have nearlyidentical intelligence test scores.b. the correlation between intelligence test scores offraternal twins is not higher than that for other siblings.c. mental similarities between adopted siblings increase withage.d. children in impoverished families have similar intelligencescores.

Ciccarelli: Psychology_5 (5th Edition)
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Chapter1: The Science Of Psychology
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The strongest support for heredity’s influence on intelligence
is the finding that
a. identical twins, but not other siblings, have nearly
identical intelligence test scores.
b. the correlation between intelligence test scores of
fraternal twins is not higher than that for other siblings.
c. mental similarities between adopted siblings increase with
age.
d. children in impoverished families have similar intelligence
scores.

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