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Disruptive Selection Graph
MCQ questions and answers.
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MCQ Questions
1. What is the typical shape of the graph representing disruptive selection?
A.
A single peak at the intermediate phenotype
B.
Two peaks at the extreme phenotypes
C.
A straight horizontal line
D.
A single peak at one extreme phenotype
Correct Answer:
Two peaks at the extreme phenotypes
Explanation:
A disruptive selection graph typically shows two peaks because individuals with extreme phenotypes are favored, while intermediate phenotypes are selected against.
2. In a disruptive selection graph, which phenotype usually has the lowest frequency after selection?
A.
The intermediate phenotype
B.
The first extreme phenotype
C.
The second extreme phenotype
D.
Both extreme phenotypes
Correct Answer:
The intermediate phenotype
Explanation:
The intermediate phenotype has the lowest frequency because disruptive selection favors both extreme phenotypes over the intermediate form.
3. On a disruptive selection graph, what do the two peaks generally represent?
A.
Two favored extreme phenotypes
B.
Two types of intermediate phenotypes
C.
Two environmental temperatures
D.
Two stages of reproduction
Correct Answer:
Two favored extreme phenotypes
Explanation:
The two peaks represent the increased frequency of individuals with two different extreme phenotypes.
4. What does the horizontal axis usually represent in a disruptive selection graph?
A.
Number of offspring
B.
Phenotypic variation
C.
Time of reproduction
D.
Population size
Correct Answer:
Phenotypic variation
Explanation:
The horizontal axis commonly shows the range of phenotypes, from one extreme through the intermediate form to the other extreme.
5. What does the vertical axis usually represent in a disruptive selection graph?
A.
Frequency of individuals
B.
Body temperature
C.
Mutation rate
D.
Length of the organism
Correct Answer:
Frequency of individuals
Explanation:
The vertical axis shows how common each phenotype is in the population.
6. In a disruptive selection graph, what happens to the middle of the original bell-shaped curve?
A.
It becomes higher
B.
It becomes lower
C.
It remains exactly unchanged
D.
It moves toward one extreme
Correct Answer:
It becomes lower
Explanation:
The middle of the curve becomes lower because intermediate phenotypes are less favored in disruptive selection.
7. Which graph pattern best indicates disruptive selection?
A.
A curve with one high peak in the center
B.
A curve with one high peak on the left
C.
A curve with two high peaks and a dip in the center
D.
A flat line with equal frequencies
Correct Answer:
A curve with two high peaks and a dip in the center
Explanation:
Disruptive selection produces two peaks for the favored extremes and a dip for the less favored intermediate phenotype.
8. If the two ends of a graph rise while the middle falls, which type of selection does the graph show?
A.
Directional selection
B.
Stabilising selection
C.
Disruptive selection
D.
Random selection
Correct Answer:
Disruptive selection
Explanation:
A rise at both extremes and a fall in the middle is the characteristic graph pattern of disruptive selection.
9. What change in the graph suggests that both extreme phenotypes are being favored?
A.
The curve develops two peaks
B.
The curve develops one central peak
C.
The curve becomes completely flat
D.
The curve loses both ends
Correct Answer:
The curve develops two peaks
Explanation:
Two peaks indicate that individuals at both ends of the phenotypic range have higher frequency or reproductive success.
10. A disruptive selection graph may show the population becoming divided into which pattern?
A.
One group with only intermediate phenotypes
B.
Two groups with different extreme phenotypes
C.
One group with only one extreme phenotype
D.
Three groups with equal phenotypes
Correct Answer:
Two groups with different extreme phenotypes
Explanation:
The two peaks in the graph indicate that the population is shifting toward two distinct extreme phenotype groups.
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