Some members of the KE family discussed in your textbook have trouble putting thoughts into words. This deficit is caused by:
A) a family tradition of ritualized abuse which causes brain trauma.
B) a family tradition of raising children without language until the age of five.
C) exposure to chemicals while still in the womb.
D) inheriting the mutated copy of a specific gene.
Answer: D
Rationale: Many members of the KE family, whose name is abbreviated to maintain their confidentiality, have inherited a mutated version of a gene on chromosome 7, known as FOXP2. These individuals have specific trouble using language.
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