Question

Homozygous purelines in cattle can be obtained by
A) Mating of individuals of different species
B) Mating of related individuals of same breed
C) Mating of unrelated individuals of same breed
D) Mating of individuals of different breed

Answer 1

Hint: Purelines is related to a variety or strain of animals or for plants which are received after multiple or subsequent rounds of inbreeding choice. in purelines, descendants from inbreeding line exhibit specific identities identical in all the later generations.

Complete answer:
Before we discuss the options, let us know a little more about Purelines. Pureline is true breeding genotypes, a line that has been affected homozygous for all genes under reflection in subsequent productions, a line in which homozygous individuals generate only homozygous offspring like parents. Thus, pure line species pertains to homozygosity only

Option B: Pureline selection is the potential to select the improved individual to improve and increase a specific trait. The homozygous genes are determined to boost a specific trait by breeding with related individuals of the same breed. Therefore this is the correct answer.

As option B is the correct answer, option A, C and D are incorrect options.Pure-line selection implicates selecting and breeding progeny from exceptional organisms for a number of generations until a pureline of bions with only the desired aspects has been ascertained.

So, the correct option is (B) i.e, Mating of related individuals of same breed

Additional information: A pureline is the progeny of a single self fertilized homozygous plant. The belief of pureline was submitted by Johannsen on the explanation of his research with beans (Phaseolus vulgaris) variety called Princess.

Note: In recent years the pure-line technique as outlined above has reduced in significance in the breeding of major cultivated varieties; however, the strategy is still widely utilized with the less significant variety that have not yet been heavily established.