Lecture 4 Flashcards
what is a disposition?
continiously distributed trait
ANOVA of behavioral genetics
genes = factor A
environment = factor B
interact
-> people react differently in the same situations, depending on their genes
difference in basepairs between humans
only 700 out of 300 million in humans
two kinds of environmental influence
shared vs unique
heritability
the part of variability that is only explained by genes
methods of heritability research
selective breeding
adoption and twin studies
index case
someone who has a trait
heritability of schizophrenia
50%
twin rates historical
peaks in 2000 due to artificial reproduction techniques
decreased by now, also because women get pregnant later
monozygotic twins vs clones
are more similar than clones
-> share mitochondial DNA
MZ neuroticism correlation
.58
DZ neuroticism correlation
.32
Big five genetic component
50%
heritability political attitudes
30%
hertiability ideology
50%
what influences lifestyle choices?
sensation-seeking
extraversion
emotionality for drinking and smoking
are twins representative?
they are in everything except birth weight
design to test parent’s behavior towardstwins
parents who mislabeled their children’s twin status
-> no indication of intentional similar treatment
sensation-seeking in BIble belt
DZ correaltion almost as high as MZ
-> very strong situation
passive gene-environment correlation
your parents are have smart genes and also a pile of books
reactive gene-environment correlation
children are prediposed to disruptive behavior, parents treat them harsh
active gene-environment correaltion
= niche picking
we choose the areas we’re best in
heritability of intelligence across countries
higher in egalitarian countries
