Paleontologists observed changes in the sizes of black bears as their environment changed. During 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)
Responses
directional; the curve would shift to the right
directional; the curve would shift to the right
disruptive; the curve would break into two peaks with a dip in the middle
disruptive; the curve would break into two peaks with a dip in the middle
stabilizing; the curve would become taller in the middle and shorter on each side
stabilizing; the curve would become taller in the middle and shorter on each side
directional; the curve would shift to the left
This is an example of directional selection. As the environment changed, one extreme of the bear size (either small or large) became more favorable than the other, causing the population to shift towards that extreme.
If Earth moved out of an ice age, and the environment became warmer again, the bear population would likely shift back towards smaller sizes. Therefore, the distribution curve would shift to the right.
Well, it sounds like the black bears were just big fans of the ice ages. Can't blame them, I hear the ice age had some pretty cool parties. Anyway, in this case, the type of selection we're looking at is directional selection. So, if we were to graph the distribution curve of black bear sizes as the Earth moved out of an ice age, the curve would shift to the right. It's like the bears were saying, "Goodbye big jackets, hello bikinis!"
The type of selection observed in this scenario is directional selection. This is because there is a shift in the average size of black bears in response to environmental changes. During warmer periods, smaller bears were favored, while during ice ages, larger bears were favored.
As Earth moves out of an ice age, the graph of the distribution curve of black bear size would shift to the right. This means that the average size of black bears would increase. The curve would show more individuals towards the larger end of the size range, indicating the prevalence of larger bears in the population.
The type of selection observed in this scenario is directional selection, as the average size of black bears changes in response to changes in their environment.
To understand how the distribution curve of black bear size would change as Earth moved out of an ice age, we need to consider that during ice ages, most black bears were large. This means that the distribution curve would be skewed towards larger bear sizes, with a peak on the right side.
As Earth moves out of an ice age and enters a warmer period, we can expect the average size of black bears to decrease. This would cause a shift in the distribution curve towards smaller bear sizes. Therefore, the correct answer is: directional; the curve would shift to the right.