Question

Match List - I with List - II. List - I
A. Inbreeding
B. Outcrossing
C. Crossbreeding
D. Inbreeding depression
List - II
I. Introduces new genes
II. Maintains pure line
III. Heterosis
IV. Reduces vigour

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

Hint:

Inbreeding → pure line
Outcrossing → new genes
Crossbreeding → heterosis

Answer 1

The Correct Option is B

Concept:
Different breeding systems are used to achieve specific genetic improvements in livestock.

Step 1: Inbreeding (A)

• Mating of related individuals.
• Used to maintain pure lines. Thus, A $\rightarrow$ II.

Step 2: Outcrossing (B)

• Mating of unrelated individuals within same breed.
• Introduces new genes and increases variation. Thus, B $\rightarrow$ I.

Step 3: Crossbreeding (C)

• Mating of different breeds.
• Produces heterosis (hybrid vigor). Thus, C $\rightarrow$ III.

Step 4: Inbreeding depression (D)

• Reduction in fitness due to inbreeding.
• Leads to decreased vigor. Thus, D $\rightarrow$ IV. Final Matching: \[ A-II,\; B-I,\; C-III,\; D-IV \] \[ \boxed{\text{Option (B)}} \]