In Your Textbook,the Smaller Frequency of Sickle-Cell Anemia Among Present

question 3

Multiple Choice

In your textbook,the smaller frequency of sickle-cell anemia among present day American blacks as compared to West African blacks is attributed to:

• A)genetic drift.
• B)gene flow.
• C)new mutations.
• D)none of the above

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Definitions:

Caudate Nucleus

A brain structure within the basal ganglia involved in various functions including learning, memory, and regulating voluntary movement.

Ventral Tegmental Area

A part of the brain involved in the reward circuitry and the release of dopamine, significant in motivation, pleasure, and addiction.

Dopamine

A neurotransmitter in the brain involved in regulating movement, emotion, cognition, motivation, and feelings of pleasure.

Activation

The process of stimulating something to act or function, often used in the context of neural or biochemical pathways.