Certified Welding Inspector Practice Exam

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In a cross-fostering study, newborn mice from two genetic strains are exchanged between mothers of the two strains. What is the main advantage of this design for behavioral genetics?

It guarantees that any behavioral difference has broad-sense heritability of 1. It eliminates all environmental variation. It converts a quantitative trait into a Mendelian trait. It separates offspring genetic background from aspects of the rearing environment.

Correct Answer:

It separates offspring genetic background from aspects of the rearing environment.

Explanation:

Cross-fostering breaks the usual association between offspring genotype and the environment provided by the biological mother. Differences that track genetic strain despite foster environment support genetic effects, while differences that track foster environment support rearing effects.

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