Matthew has the genetic potential to have an above average IQ. However, he has been placed in a foster homewhere he is never read to, no one speaks to him, and he is left to play alone much of the day. When he starts firstgrade, his measured IQ is 85. This is an example of the concept of
A. codominance.
B. norm of reaction.
C. Down syndrome.
D. genetically regulated rate of growth.
Answer: B
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