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Scientists have found that certain genes become turned on or off as a result of exercise mainly through a process called ________, in which tiny atoms attached themselves to the outside of a gene.


A) genotyping
B) methylation
C) glycolysis
D) hydroxylation

E) None of the above
F) All of the above

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Deshawn believes that development is the result of an ongoing, bidirectional interchange between heredity and environment. He has most likely adopted which theoretical perspective?

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Jerome and Tyrone are fraternal twins. This means that they developed from


A) a single egg that was fertilized by a single sperm.
B) a single egg that was fertilized by two different sperms.
C) two eggs that were fertilized by a single sperm.
D) two eggs that were fertilized by two different sperms.

E) None of the above
F) A) and B)

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Charlie is a cooperative, attentive child and is a favorite at home and school; he receives positive, instructive responses from adults. This is indicative of a(n)


A) passive genotype-environment correlation.
B) evocative genotype-environment correlation.
C) influential genotype-environment correlation.
D) active (niche-picking) genotype-environment correlation.

E) A) and B)
F) A) and C)

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________ uses a powerful magnet and radio images to generate detailed images of the body's organs and structures.


A) Triple screen
B) MRI
C) Ultrasound sonography
D) Amniocentesis

E) A) and D)
F) C) and D)

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