Why Do False-Negative Rh Testing Results Occur in Babies with Severe

question 24

Multiple Choice

Why do false-negative Rh testing results occur in babies with severe hemolytic disease of the newborn due to anti-D?

• A) The cord cells may be contaminated with Wharton's jelly.
• B) All D sites are covered by maternal anti-D, which blocks the reagent.
• C) Antigens are not expressed yet.
• D) None of the above

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Definitions:

Genetic Heritability

The proportion of variation in traits within a population that is due to genetic differences among individuals.

Extraversion-Introversion

A personality dimension that contrasts tendencies toward sociability, enthusiastic activities versus reflection, and quiet activities.

Twin-Study Method

A research method in psychology that examines the relative contribution of genetic and environmental influences on traits by comparing the similarity of identical and fraternal twins.

Extraverts

Individuals who are outgoing, sociable, and draw energy from interacting with others.