warmer periods between ice ages, most black bears were small. During ice ages, most black bears
were large. Which type of selection is this, and how would a graph of the distribution curve of black
bear size change as Earth moved out of an ice age? (1 point)
O directional: the curve would shift to the left
O disruptive; the curve would break into two peaks with a dip in the middle
O
stabilizing; the curve would become taller in the middle and shorter on each side
O
directional; the curve would shift to the right
1 answer
The type of selection observed in this scenario is directional selection, as the size of black bears shifts from large during ice ages to small during warmer periods. As Earth moves out of an ice age, you would expect the graph of the distribution curve of black bear size to shift to the left, indicating a change towards smaller sizes.
Thus, the correct answer is:
O directional; the curve would shift to the left.
