Dictionary of Human Evolution and Biology

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Carrier

1. an individual who harbors the agent of an infectious disease without manifesting symptoms.

2. a heterozygous individual possessing one copy of a recessive allele or chromosomal structural defect that is not fully expressed because of the presence of a normal allele on the homologous chromosome.

3. a substance in a cell that can temporarily bind with other molecules.

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From "Dictionary of Nursing and Individual Health Care"