Researchers plotted a distribution curve for leg length in a population of birds, with length from short to long on the x-axis. The curve shifts to the right after a disturbance. Which statement is correct about natural selection in this population of birds?(1 point)
Responses
Birds with short legs were selected for.
Birds with short legs were selected for.
Birds with medium-length legs were selected for.
Birds with medium-length legs were selected for.
Birds with long legs and birds with short legs were selected for.
Birds with long legs and birds with short legs were selected for.
Birds with long legs were selected for.
Birds with long legs were selected for.
disruptive selection; two peaks at the extremes of the graph with a dip in the middle
directional selection; the curve would shift to the right
directional; the curve would shift to the left
In peppered moth populations, light and dark moths are selected for in different environments. Which type of selection is this, and what would a distribution curve for all peppered moths look like?(1 point)
Responses
disruptive selection; two peaks at the extremes of the graph with a dip in the middle
disruptive selection; two peaks at the extremes of the graph with a dip in the middle
stabilizing selection; two peaks at the extremes of the graph with a dip in the middle
stabilizing selection; two peaks at the extremes of the graph with a dip in the middle
disruptive selection; a tall, narrow peak in the center of the graph
disruptive selection; a tall, narrow peak in the center of the graph
stabilizing selection; a tall, narrow peak in the center of the graph
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?(1 point)
Responses
directional selection; the curve would shift to the right
directional selection; the curve would shift to the right
directional selection; the curve would shift to the left
directional selection; the curve would shift to the left
stabilizing selection; the curve would become taller in the middle
stabilizing selection; the curve would become taller in the middle
stabilizing selection; the curve would become shorter in the middle
In a population of mice, individuals with medium brown fur are less likely to be seen by predators than light brown and dark brown mice. What type of selection is this, and what would the distribution curve for the mouse population look like?(1 point)
Responses
stabilizing; a tall, narrow peak in the center of the graph
stabilizing; a tall, narrow peak in the center of the graph
stabilizing; two peaks at either end of the graph with a dip in the middle
stabilizing; two peaks at either end of the graph with a dip in the middle
disruptive; a tall, narrow peak in the center of the graph
disruptive; a tall, narrow peak in the center of the graph
disruptive; two peaks at either end of the graph with a dip in the middle
Mathematics of Natural Selection Quick Check
5 of 55 of 5 Items
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)
Responses
directional; the curve would shift to the left
directional; the curve would shift to the left
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
directional; the curve would shift to the right
directional; the curve would shift to the right
stabilizing; the curve would become taller in the middle and shorter on each side