After the Stress of Breaking Up with His Girlfriend,Eric Came

question 137

Multiple Choice

After the stress of breaking up with his girlfriend,Eric came down with a severe respiratory infection.His infection may have spread very rapidly due to a(n) ________ in his body's production of ________.

• A) decrease;glucocorticoids
• B) increase;NK cells
• C) decrease;lymphocytes
• D) increase;telomeres

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Definitions:

Hardy-Weinberg Principle

A fundamental principle in genetics stating that allele and genotype frequencies in a population remain constant from generation to generation in the absence of evolutionary influences.

Genetic Equilibrium

A condition in which the frequency of alleles in a population remains stable from generation to generation in the absence of disturbing factors.

Allele Frequencies

A measure of the relative frequency of an allele (variant of a gene) at a genetic locus in a population, expressed as a proportion or a percentage.

Directional Selection

The gradual replacement of one phenotype with another because of environmental change that favors phenotypes at one of the extremes of the normal distribution. Compare with stabilizing selection and disruptive selection.