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Cards (7)
aim
How does intelligence depend on
genetics
?
method
Twin family design
sample
112
families
from the
Netherlands
,
twin
registry
23
monozygotic boy twins,
23
monozygotic girl twins,
12
Dz
girls,
13
Dz
boys,
20
Dz
mixed gender twins
procedure
Parents in child completed the
ravens,
progressive matrices
for adults or children
results
higher
correlation for
monozygotic
twins than other family members
Overall level of
inheritance
is
67
%
conclusions
Biology
influences
intelligence
AO2
biological
factors influence
intelligence
as they share
genetic
makeup
Environment
at home may have affected this but the
correlation
for
Dz
twins was not as
strong
They share
genetics
and
biology,
explaining why
monozygotic
twins correlation was
higher
Majority of influence comes from
biology
and
genes
when looking at IQ
Siblings aged between
9
and
12
had similar results to their families
It cannot be proven that this is due to
biological
factors as
environment
and
upbringing
also
influence
IQ.
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