Question

Match types of variation in column I with their causes in column II. Select the correct option.

Column I	Column II
A. Gene mutation	I. occurs due to crossing over
B. Gene recombination	II. caused due to natural disasters
C. Gene flow	III. sudden permanent heritable change
D. Genetic drift	IV. migration of organisms

• A. A-III, B-I, C-II, D-IV
• B. A-III, B-I, C-IV, D-II
• C. A-I, B-II, C-III, D-IV
• D. A-I, B-III, C-II, D-IV

Hint:

Link each source of variation (mutation, recombination, gene flow, drift) with how it arises.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
Variation in a population arises through mutation, recombination, gene flow and genetic drift.

Step 2: Match the first two
Gene mutation is a sudden permanent heritable change (III). Gene recombination occurs due to crossing over (I).

Step 3: Match the last two
Gene flow is the movement of alleles when organisms migrate (IV). Genetic drift is a chance change in allele frequency, often after natural disasters shrink a population (II).

Step 4: Select the option
The combination A-III, B-I, C-IV, D-II is given in option B.

Final Answer:
The correct matching is A-III, B-I, C-IV, D-II. \[ \boxed{\text{(B) }\text{A-III, B-I, C-IV, D-II}} \]