A. disruptive selection; two peaks at the extremes of the graph with a dip in the middle
Explanation: Disruptive selection occurs when individuals with extreme phenotypes are favored over intermediate phenotypes, leading to the formation of two distinct peaks in the distribution curve. In the case of peppered moths, light and dark moths are selected for in different environments, resulting in two distinct peaks for light and dark moths with a dip in the middle where intermediate individuals are less common.
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?
A. disruptive selection; two peaks at the extremes of the graph with a dip in the middle
B. stabilizing selection; a tall, narrow peak in the center of the graph
C. disruptive selection; a tall, narrow peak in the center of the graph
D. stabilizing selection; two In peppered moth populations, light and dark moths are selected for in different environments.
7 answers
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?
A. stabilizing selection; the curve would become shorter in the middle
B. directional selection; the curve would shift to the left
C. stabilizing selection; the curve would become taller in the middle
D. directional selection; the curve would shift to the right
A. stabilizing selection; the curve would become shorter in the middle
B. directional selection; the curve would shift to the left
C. stabilizing selection; the curve would become taller in the middle
D. directional selection; the curve would shift to the right
D. directional selection; the curve would shift to the right
Explanation: In this scenario, female reindeer giving birth to larger offspring over generations indicates directional selection favoring larger size. This results in a shift in the distribution curve to the right, reflecting an increase in the average size of offspring in the population over time.
Explanation: In this scenario, female reindeer giving birth to larger offspring over generations indicates directional selection favoring larger size. This results in a shift in the distribution curve to the right, reflecting an increase in the average size of offspring in the population over time.
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?
A. stabilizing; two peaks at either end of the graph with a dip in the middle
B. disruptive; a tall, narrow peak in the center of the graph
C. stabilizing; a tall, narrow peak in the center of the graph
D. disruptive; two peaks at either end of the graph with a dip in the middle
A. stabilizing; two peaks at either end of the graph with a dip in the middle
B. disruptive; a tall, narrow peak in the center of the graph
C. stabilizing; a tall, narrow peak in the center of the graph
D. disruptive; two peaks at either end of the graph with a dip in the middle
D. disruptive; two peaks at either end of the graph with a dip in the middle
Explanation: In this scenario, individuals with medium brown fur are at a disadvantage compared to light brown and dark brown mice due to predation. This kind of selection leads to disruptive selection, where individuals with extreme traits (light and dark brown fur) are favored over those with intermediate traits (medium brown fur). Therefore, the distribution curve for the mouse population would show two peaks at either end representing light and dark brown mice, with a dip in the middle for medium brown mice.
Explanation: In this scenario, individuals with medium brown fur are at a disadvantage compared to light brown and dark brown mice due to predation. This kind of selection leads to disruptive selection, where individuals with extreme traits (light and dark brown fur) are favored over those with intermediate traits (medium brown fur). Therefore, the distribution curve for the mouse population would show two peaks at either end representing light and dark brown mice, with a dip in the middle for medium brown mice.
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?
A. directional; the curve would shift to the right
B. directional; the curve would shift to the left
C. stabilizing; the curve would become taller in the middle and shorter on each side
D. disruptive; the curve would break into two peaks with a dip in the middle
A. directional; the curve would shift to the right
B. directional; the curve would shift to the left
C. stabilizing; the curve would become taller in the middle and shorter on each side
D. disruptive; the curve would break into two peaks with a dip in the middle
A. directional; the curve would shift to the right
Explanation: In this scenario, the change in the size of black bears based on environmental conditions (smaller during warmer periods and larger during ice ages) indicates directional selection. As Earth moves out of an ice age, the distribution curve of black bear size would shift to the right, reflecting an increase in the average size of black bears in the population due to the change in environmental conditions.
Explanation: In this scenario, the change in the size of black bears based on environmental conditions (smaller during warmer periods and larger during ice ages) indicates directional selection. As Earth moves out of an ice age, the distribution curve of black bear size would shift to the right, reflecting an increase in the average size of black bears in the population due to the change in environmental conditions.
1 answer