On the right is human infant mortality rate (per 1,000 live births) vs. birth weight (kgs) in the US from 1950 and 1998. If the birth weight is heritable, then the observed relationship can impose a 1000- 100 10 1950 1998 1.0 2.0 3.0 4.0 Birth Weight (kgs) O Directional selection for a lower birth weight O Disruptive selection for both high and low birth weights O Stabilizing selection for a medium birth weight O Negative frequency-dependent selection for the rarer birth weight None of the above Neonatal Mortality (per 1000 live births)

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