Question:
Consider the following statements:
Statement I: Evolution of species in a single lineage is called anagenesis
Statement II: If speciation takes place due to geographical isolation, it is called allopatric speciation
Consider the following statements:
Statement I: Evolution of species in a single lineage is called anagenesis
Statement II: If speciation takes place due to geographical isolation, it is called allopatric speciation
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Anagenesis = evolution within one lineage. Allopatric speciation = speciation due to geographical isolation.
Updated On: Jun 17, 2026
- Both statement I and statement II are true
- Statement I is true and statement II is false
- Statement I is false and statement II is true
- Both statement I and statement II are false
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The Correct Option is A
Solution and Explanation
Concept:
Evolutionary biology describes different mechanisms through which species evolve and diversify over time.
Step 1: Evaluating Statement I.
Anagenesis refers to evolutionary change occurring within a single lineage without branching. One species gradually transforms into another over time. Therefore Statement I is true.
Step 2: Evaluating Statement II.
Allopatric speciation occurs when populations become geographically separated by mountains, rivers, oceans, or other barriers. This isolation eventually leads to formation of new species. Therefore Statement II is also true.
Step 3: Final conclusion.
Since both statements are scientifically correct, the correct option is: \[ \boxed{\text{Both Statement I and Statement II are true}} \]
Step 1: Evaluating Statement I.
Anagenesis refers to evolutionary change occurring within a single lineage without branching. One species gradually transforms into another over time. Therefore Statement I is true.
Step 2: Evaluating Statement II.
Allopatric speciation occurs when populations become geographically separated by mountains, rivers, oceans, or other barriers. This isolation eventually leads to formation of new species. Therefore Statement II is also true.
Step 3: Final conclusion.
Since both statements are scientifically correct, the correct option is: \[ \boxed{\text{Both Statement I and Statement II are true}} \]
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