Suppose a researcher finds a correlation coefficient of .40 between identical twins' scores on a measure of a personality trait. She additionally finds a correlation coefficient of .40 between fraternal twins' scores on the same measure. What might she conclude regarding the genetic and environmental bases of the trait
A)The trait reflects shared environmental factors because the two coefficients are moderate and similar.
B)The trait reflects genetic factors because the coefficients are moderate.
C)The trait reflects shared environmental factors because the two coefficients are not especially high.
D)The trait reflects non-shared environmental factors because the two coefficients are not especially high.

Question

Quizplus · Accepted Answer

The similarity in correlation coefficients for both identical and fraternal twins suggests that shared environmental factors, rather than genetic factors, play a significant role in the trait, as identical twins share more genetic material than fraternal twins but show similar correlation in traits.

Suppose a Researcher Finds a Correlation Coefficient of