10. Scale color in a population of lizard ranges from tan through brown. A prolo
ID: 273566 • Letter: 1
Question
10. Scale color in a population of lizard ranges from tan through brown. A prolonged drought kills much of the vegetation in the area where the lizards live, exposing light-colored sandstone. On sandstone, brown lizards are more visible to predators than tan lizards. Within a few generations, the percentage of tan lizards has increased. Conversely, the percentage of brown lizards has decreased.
What form of selection has taken place in this population?
A) stabilizing selection
B) disruptive or diversifying selection
C) frequency-dependent selection
D) directional selection
Explanation / Answer
D.
In this example, there are two extremes brown and tan. It is given that the selection increases the percentage of tan lizards. This is an example of directional selection in which selection is favoured towards a particular direction which in our case is the tan colour.
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