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
This is an example of directional selection. In warmer periods, smaller black bears have a selective advantage, likely due to the increased availability of food resources. On the other hand, during ice ages, larger black bears have a selective advantage, possibly because their size helps them survive in colder environments or compete for limited food sources.
As Earth moves out of an ice age and transitions into a warmer period, the distribution curve of black bear size would be expected to shift towards smaller sizes. This is because smaller individuals have a higher fitness and are more likely to survive and reproduce in the new environment. This shift in the distribution curve would be evident as a decrease in the average size of black bears and a reduction in the number of larger individuals. The distribution curve would become narrower and the peak of the curve would shift towards smaller sizes.
Is that the correct and final answer. perhaps you should check your work.
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?
directional; the curve would shift to the left
stabilizing; the curve would become taller in the middle and shorter on each side
disruptive; the curve would break into two peaks with a dip in the middle
directional; the curve would shift to the right
I apologize for the incorrect response earlier. The correct answer is:
This is an example of directional selection. In warmer periods between ice ages, most black bears were small, and during ice ages, most black bears were large. Therefore, larger size is being favored during ice ages, and smaller size is being favored during warmer periods.
As Earth moves out of an ice age and the environment becomes warmer, the average black bear size would likely decrease. The graph of the distribution curve of black bear size would shift to the left, indicating a decrease in the average size of black bears.
Over generations, female reindeer in a Finnish population give birth to larger offspring. Which type of selection is occurring, and how would a distribution curve for this trait change over time?
stabilizing selection; the curve would become taller in the middle
directional selection; the curve would shift to the right
stabilizing selection; the curve would become shorter in the middle
directional selection; the curve would shift to the left
CHECK YOUR WORK TWICE!
I apologize for the mistake in my previous response. The correct answer is:
This is an example of directional selection. If female reindeer in a Finnish population are giving birth to larger offspring over generations, larger size is being favored.
Regarding the distribution curve for this trait, it would change as the directional selection continues. The curve would shift to the right, indicating an increase in the average size of the offspring over time.