Interaction
of
Heritability & Environment

Variation can be quantified

**mean
standard deviation: **

**variance: **^{2}

Variation has
two sources: **genetic**
(_{G}^{2})
&
**environmental**
(_{E}^{2})
**variance**

**
phenotypic variance **_{P}^{2}
= _{G}^{2}
+ _{E}^{2}
+ _{GxE}^{2}

**
additive
variance **_{A}^{2}
= _{G}^{2}
+ _{E}^{2 }

**heritability
h ^{2}** =

Each child's IQ score has been raised by modified adoptive environment.

IQ scores of Biological Parents and their Children remain perfectly correlated (BxC): h

Mean IQ score of Children is identical to that of

AND scores of Children and

( 8 + 2 - 4 + 4 - 6 - 4 ) = 0 / 6 = 0

HOMEWORK: Is it possible that

All text material © 2014 by Steven M. Carr