Isabelle Was Born with Down Syndrome

Multiple Choice

Isabelle was born with Down syndrome.Her parents have provided her with a stimulating and enriching learning environment.Even though she has achieved a higher level of intellectual functioning than other Down syndrome individuals,she will never be as intelligent as her peers with normal chromosomal structure.This observation is consistent with the concept of

A) concordance rate.
B) range of reaction.
C) genotype.
D) temperament.