Question

Match the following:

• A. A-III, B-IV, C-I, D-V
• B. A-II, B-IV, C-V, D-I
• C. A-III, B-V, C-I, D-II
• D. A-III, B-IV, C-I, D-II {Correct Answer:} (3) A-III, B-V, C-I, D-II

Hint:

Natural selection can take different forms—directional selection favors one extreme trait, while genetic drift and bottleneck effects lead to random changes in allele frequencies.

Answer 1

The Correct Option is C

Directional selection (A-III): A type of natural selection where an advantageous trait (e.g., DDT resistance in mosquitoes) becomes more common over time.
Genetic load (B-V): The accumulation of harmful mutations can lead to genetic disorders like sickle cell anaemia.
Bottleneck effect (C-I): A sudden reduction in population size causes genetic drift, leading to traits like polydactyly in dwarfs.
Centrifugal selection (D-II): Occurs when multiple advantageous traits are selected, as seen in Darwin’s finches adapting to different environments.