NEET Botany Strategies for Enhancement in Food Production Questions Solved

BOARD

Differentiate between inbreeding and outbreeding in cattle. State one advantage and one disadvantage for each one of them.                                                                                             (3)

        Inbreeding                                                                              Outbreeding

Mating of more closely related individuals                               Breeding of the unrelated animals

within the same breed for 4-6 generations.                             which may be between individuals of

                                                                                           the same breed but having no 

                                                                                           common ancestors for 4-6

                                                                                           generations.

                                                                                         

                                                                                           

 Inbreeding 

Advantages:

1. It is used to evolve a pure line in any animal.

2. Inbreeding exposes harmful recessive genes that are eliminated by selection. 

3. It also helps in accumulation of superior genes and eliminatiom of less desirable genes.  

Disadvantage: Continued inbreeding causes inbreeding depression that reduces fertility and even productivity.

Outbreeding 

Advantages:

1. A single outcross helps to overcome inbreeding depression, i.e., fertility and yield in animals.

2. New animal breeds can be developed by cross-breeding, e.g., Hisardale is a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Marino rams. 

3. Outcrossing is the best method for animals that are below average in productivity and growth rate.

Disadvantages:

1. Genes required for adaptation to particular environment are lost or suppressed.

2. In polygynous species advantage of having extra-closely related offspring is lost and parental genes will be less expressed in the next generation.                                                                (3)

Difficulty Level:

  • 100%
  • 0%
  • 0%
  • 0%