Sickle Cell Anemia Is Often Lethal in Childhood, Yet the Gene

question 36

Multiple Choice

Sickle cell anemia is often lethal in childhood, yet the gene for sickle cell hemoglobin persists in the human population. Which statement BEST describes why this is the case?

• A) Individuals with sickle cell anemia are healthier than are normal individuals.
• B) Individuals with sickle cell trait can carry more oxygen in their blood than do normal individuals.
• C) Individuals with normal hemoglobin have malaria infections less often than do individuals with sickle cell trait.
• D) Individuals with sickle cell trait are protected from malaria infection, while normal individuals are not.
• E) Individuals with sickle cell anemia have more hemoglobin in their blood than do normal individuals.

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Definitions:

James-Lange Theory

The James-Lange Theory proposes that emotions result from the interpretation of bodily responses to external stimuli, before the emotion is experienced.

Conscious Experience

The awareness of the self, one's thoughts, and the environment, forming the basis of subjectivity and personal experience.

Autonomic Arousal

The activation of the autonomic nervous system, governing involuntary physiological responses to stimuli.

Fear

A primal emotion triggered by the perception of danger, real or imagined, leading to fight-or-flight responses.