Question

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)

Answer 1

so whats the answer maybe try short ressponses

Answer 2

sorry i spelled that wrong

Answer 3

directional; the curve would shift to the left should have been the answer

Answer 4

This is an example of stabilizing selection.

During ice ages, larger black bears have an advantage because their size helps them withstand the harsh conditions. On the other hand, during warmer periods, smaller black bears have an advantage because their smaller size allows them to better navigate the environment and obtain food resources.

If the Earth moved out of an ice age, the distribution curve of black bear size would shift towards smaller sizes. This is because the smaller bears would have a higher reproductive success and survival rate in the new environmental conditions. Over time, this would lead to a decrease in the average size of black bears.

Answer 5

Type of selection: Stabilizing selection
Graph of size distribution: Shift towards smaller sizes

Answer 6

No problem! Here's the corrected response:

Type of selection: Stabilizing selection
Graph of size distribution: Shift towards smaller sizes

Answer 7

Apologies for the confusion. I misunderstood your question.

You are correct. The type of selection described is directional selection, as there is a shift in the average size of black bears towards larger sizes during ice ages and smaller sizes during warmer periods.

If Earth moved out of an ice age, the distribution curve of black bear size would shift towards smaller sizes, which means the curve would shift to the left. Thank you for pointing out the correct answer.