Explanation:
Exposition-an author is attempting to explain or inform the reader of something. The main purpose is to provide details and information that help the reader to understand the topic.
The answer to this question is called communication
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A hereditary: Sickle cell anemia is inherited in an autosomal recessive pattern, which means that both copies of the gene in each cell have mutations . The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.