How are twin studies used to estimate the heritability of attitudes?
A)The rate of agreement for identical twins on an issue gives an estimate of how heritable it is.
B)The rate of agreement for fraternal twins on an issue gives an estimate of how heritable it is.
C)The rate of agreement for identical twins on an issue,minus the rate for fraternal twins,gives an estimate of how heritable it is.
D)The rate of agreement for fraternal twins on an issue,minus the rate for identical twins,gives an estimate of how heritable it is.

Question

Quizplus · Accepted Answer

The heritability of attitudes is estimated by comparing the rate of agreement between identical twins and fraternal twins. Identical twins share more genetic material, so a higher rate of agreement among them compared to fraternal twins suggests a genetic influence.

How Are Twin Studies Used to Estimate the Heritability of Attitudes