Human Growth and Development / Unit 18 HGD 2581 short lesson, about 20 seconds
Genes, Environment and Reaction Range
Captions available
The idea
The intelligence arc begins with reaction range, entry 0013: genes set limits, and environment decides where within them a person lands.
In practice
Twin and adoption studies showing genetic influence on intelligence, entry 0927, while lead exposure lowers it and stimulating experiences support it, entry 0928.
Where people slip
No single intelligence gene exists; heritability describes variation across a population, entry 0927.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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