Question

What is true about inbreeding?

Inbreeding helps to eliminate lethal characters.
Inbreeding depression negatively impacts productivity.
Inbreeding increases Hybrid Viguor.
Inbreeding increases genetic variance between lines.

• A. A, B and D only
• B. A, B and C only
• C. A, C and D
• D. B, C and D only

Hint:

Inbreeding is a double-edged sword: it increases homozygosity, which is good for fixing desirable traits but bad due to the risk of inbreeding depression.

Answer 1

The Correct Option is A

Analysis of the statements:

Statement A is True: Inbreeding elevates homozygosity, exposing recessive lethal alleles for identification and removal from the breeding population.
Statement B is True: Inbreeding depression, characterized by decreased fitness, fertility, and productivity, is a recognized outcome of inbreeding.
Statement C is False: Inbreeding diminishes vigor. Hybrid vigor (heterosis) arises from outbreeding or crosses between distinct inbred lines.
Statement D is True: Inbreeding decreases genetic variance within a line, promoting uniformity, but simultaneously elevates genetic variance between separate inbred lines.
In conclusion, statements A, B, and D are correct.