Question

Which of the following is necessary if we want to evolve a pure line in any animal

a) outcrossing
b) inbreeding
c) outbreeding
d) crossbreeding ​

Answer 1

Answer:

Option b) Inbreeding

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Explanation:

Group of animals which are similar in characters is known as Breed.

Breed are of two types :-

1) Inbreeding

• If breeding is between animals of same breed or more closely related animals.
• In this superior female and superior male of same breed are mated with each other. So, that the progeny that formed by such mating (cross) is also a superior.
• Such type of mating is useful to involve a pure line in any animal.

2) Outbreeding

• If breeding is between animals of different breed or unrelated animals.

It is further of three types :-

a) Out crossing :- It is best method to improve inbreeding depression.

b) Cross breeding :- The progeny formed by this or such mating is useful in commercial production.

When Bikaneri ewes and Marino rams are mated with each other then the Hisardale is formed or obtained.

c) Interspecific hybridisation :- The progeny formed by this or such mating is useful in economical value.

When male donkey and female horse are mated with each then Mule a new breed is obtained.

Answer 2

Question :-- Which of the following is necessary if we want to evolve a pure line in any animal

a) outcrossing

b) inbreeding ✅✅

c) outbreeding

d) crossbreeding

Answer :--- b) inbreeding.

Explanation :---

• A pure line in animals is raised through inbreeding.
• it is a progeny or single , self fertilized homozygous individuals.

Advantages of Inbreeding :--

• This process increase homozygosis .
• It mainly helps in accumulation of super genes and elimination of less desirable genes.
• Inbreeding exposes harmful recessive genes that are eliminated by selection ..

Dis - advantage :-

• Continued inbreeding can reduce fertility and also productivity.