Experiments That First Identified a Role for the MHC Gene

question 36

Multiple Choice

Experiments that first identified a role for the MHC gene locus in tissue identification were successful in mice because:

• A)mice can yield large litters,and great numbers of offspring were needed for genetic analyses.
• B)mice have very small genomes,making it easier to link genetic changes to functional changes.
• C)mice with identical genetic backgrounds were able to accept tissue transplants,but other strains of mice rejected the tissue.
• D)mice without intact immune systems are routinely used to study the effects of MHC molecules.

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Definitions:

Positive Affect

A psychological state that involves feelings of enthusiasm, pleasure, and happiness.

Hedonic Treadmill

The observed tendency of humans to quickly return to a relatively stable level of happiness despite major positive or negative events or life changes.

Facial Feedback

The hypothesis that facial expressions can influence emotional experiences, suggesting that mimicking an emotional expression can produce the corresponding emotional state.

Hypothesis

A testable prediction that derives logically from a theory.