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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 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 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 stabilizing selection; the curve would become shorter in the middle 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

n 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 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 disruptive; 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 stabilizing; two peaks at either end of the graph with a dip in the middle stabilizing; a tall, narrow peak in the center of the graph

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 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 right

1 answer

  1. For the peppered moth populations, this scenario describes disruptive selection. In this case, the distribution curve would look like two peaks at the extremes of the graph with a dip in the middle.

  2. In the scenario of female reindeer giving birth to larger offspring, this represents directional selection. As a result, the distribution curve for this trait would shift to the right over time.

  3. In the population of mice where medium brown fur is favored, this is also an example of stabilizing selection. The distribution curve for the mouse population would have a tall, narrow peak in the center of the graph.

  4. Regarding the black bears and the changing sizes due to environmental changes, this depicts directional selection. As Earth moved out of an ice age, the distribution curve would shift to the right.

Here's a summary of the answers:

  1. Disruptive selection; two peaks at the extremes of the graph with a dip in the middle.
  2. Directional selection; the curve would shift to the right.
  3. Stabilizing selection; a tall, narrow peak in the center of the graph.
  4. Directional selection; the curve would shift to the right.