Which of the following are true, caused due to Inbreeding?

A. Continued inbreeding, especially close inbreeding, usually reduces fertility and productivity.

B. Inbreeding selects harmful recessive genes that reduce fertility and productivity.

C. Helps to evolve a hybrid in any animal.

D. Helps in accumulation of superior genes.

E. Inbreeding decreases homozygosity.

Choose the correct answer form the options given below:

A & D Only

The correct answer is Option (2)-  A & D Only

Inbreeding increases homozygosity. Thus inbreeding is necessary if we want to evolve a pureline in any animal. Inbreeding exposes harmful recessive genes that are eliminated by selection. It also helps in accumulation of superior genes and elimination of less desirable genes. Therefore, this approach, where there is selection at each step, increases the productivity of inbred population. However, continued inbreeding, especially close inbreeding, usually reduces fertility and even productivity. This is called inbreeding depression. Whenever this becomes a problem, selected animals of the breeding population should be mated with unrelated superior animals of the same breed. This usually helps restore fertility and yield.