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Behavioral Genetics
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Nature vs Nurture?Wolves vs dogs?Did we selectively breed
dogs by appearance
and even behaviors?
Are our behaviors including
emotion governed by our genes?
Are these passed from parents to
children as in the saying “like
father like son”?
Behavioral Genetics
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Environment
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How do these interact to shape what we are now?From basic behaviors such as foraging to complex behaviors
such as social interactions and intelligence
Environment
Behavioral genes that make the news!
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The “Wanderlust Gene”: Why Some People Are Born To Travel
“The gene itself, which is identified as DRD4-7R, has been dubbed
the ‘wanderlust gene’, because of its correlation with increased
levels of curiosity and restlessness, for the most part.”
– Elite Daily , on Mar 3, 2015
What is the biology behind such claims?
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Serotonin – the ‘happy gene’
Neurotransmitter that
regulates mood balance
Sample from Dr. Amy Kwok
regulates mood balance
Find out YOUR behavior traits…
vs
Tongue rolling
… is actually controlled by
a single gene!
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Punnett’s Square
use to calculate the possibility of single-gene
inheritance
R r
R RR Rr
r Rr rr
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Why are twins preferred in behavioral
genetics studies?
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Share
IDENTICALgenetic makeup
Share ¼ genes
(same as siblings)
Identical twins Fraternal twins Sa
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In-class discussion
My DNA made me do it.My DNA made me do it.
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My DNA made me do it.My DNA made me do it.
In 2007, several psychiatrists and geneticists presented evidence at a criminal
trials: a variant of monoamine oxidase A increases the risk of violent behavior.
Applying what you learnt from previous sessions,
1) To what degree do you agree with the statement?
2) Do you support the use of genetic screening of suspects/criminals as proof
of their guilt/innocence?
3) Why?
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