PSY230H5 Lecture Notes - Lecture 12: Twin Study, Multiple Dispatch, Church Attendance

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Published on 27 Oct 2016
School
Department
Course
Lecture 12: Genetic and Environmental Effects on
Personality: The Evidence
Thursday, October 27, 2016
9:20 AM
MC Practice Questions
o Which statement about modern evolutionary theory of human sexuality correct?
?
o Which of the following statements is correct?
D
Gender differences in behs still exist but they explain less than 50% of the variance in
sexual attitudes
o I presented data on the stability of various pers characteristics (e.g., attractiveness, intelligence,
BF), after taking measurement error into account. Based on these correlations, what is the
probability that an indiv who is above average in intelligence is still above average in intelligence 5
yrs later?
E
--> 91-100%
o A twin studies of life-satisfaction (LS) found a correlation of r=0.4 for MZ twins and correlation of
r=0.1 for DZ twins. What can we conclude from this finding?
E
--> the effects of genes on LS are complicated (non-additive)
Genetic and Environmental Effects on Personality: The Evidence
o How much of the variance in BF traits is due to variation in parenting styles across parents (shared
env)?
o Heritability of the BF
There have bene dozens of twin studies of pers traits (mainly E and N, but also O, A, and C)
The typical textbook estimate of heritability for BF is 40-50%
About 1/2 of variation seems to be due to genetics
Estimates are attenuated by measurement error
One multi-method study found heritability estimates around 70%
The estimates for shared env are typically close to 0%!!!
o Shared environment matters: smoking
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MZ twins more similar than DZ twins
Shows evidence of genes mattering
Shared env matter bc DZ twins is more than half of MZ twins
o The twin/adoption design: smoking
o Twin study of religiosity
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