In Small Populations,gene Frequencies Can Change Drastically by Chance Alone

question 32

Multiple Choice

In small populations,gene frequencies can change drastically by chance alone.This phenomenon is called:

• A)migration
• B)density-independent effects
• C)density-dependent effects
• D)genetic drift

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Definitions:

Serotonin

A neurotransmitter believed to play a central role in regulating mood, emotions, and sleep.

Cognitive Therapy

A type of psychotherapy focused on changing negative patterns of thought to improve mood and alter behavior.

Antidepressant Drugs

Medications prescribed to alleviate symptoms of depression by adjusting the balance of neurotransmitters in the brain, impacting mood and emotional state.

Limbic System

A complex system of nerves and networks in the brain, involved in instincts and emotions such as fear, pleasure, and happiness.