A Close Friend Who for Years Has Suffered from Wintertime

question 82

Multiple Choice

A close friend who for years has suffered from wintertime depression is seeking your advice regarding the effectiveness of light-exposure therapy. What should you tell your friend?

• A)"Don't waste your time and money. It doesn't work."
• B)"A more effective treatment for seasonal affective disorder is eye movement desensitization and reprocessing."
• C)"You'd be better off with a prescription for lithium."
• D)"It might be worth a try. There is some evidence that morning light exposure produces relief."

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Definitions:

Physical Linkage

The adjacency of two or more loci on the same chromosome.

Genetic Recombination

The exchange of genetic material between paired chromosomes during meiosis. Recombination can form new combinations of alleles and is a source of heritable variation.

Heritability

A measure of how much of the variation in a trait within a population is due to genetic differences among individuals in that population.

Selection Differential

A measure in quantitative genetics that quantifies the difference between the mean phenotype of selected individuals for breeding and the mean phenotype of the general population, driving evolutionary changes.