22. Evolution of Populations
Natural Selection
Multiple Choice
Multiple ChoiceThe graph below shows the birthweights and infant mortality rate as recorded by researchers in London between 1935 and 1946. The bars represent the number of births recorded in 0.5-pound increments. The orange dots represent the mortality rate for each birthweight and are shown on a logarithmic scale. What type of selection does this graph suggest directly affects human birth weight?
Graph adapted from: M.N. Karn and L.S. Penrose, Birth Weight and Gestation Time in Relation to Maternal Age, Parity, and Infant Survival. Annals of Eugenics, January 1951, Vol. 16 No. 1., Page 147-164.
A
Diversifying selection.
B
Stabilizing selection.
C
Artificial selection.
D
Directional selection.
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