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By which method was a new breed 'Hisardale' of sheep formed by using Bikaneri ewes and Marino rams?
Bikaneri ewe (indigenous breed) mated with Merino ram (exotic Australian breed) represents mating superior individuals of TWO DIFFERENT BREEDS. By definition, this is Cross Breeding! Mark Option (3) in 5 seconds.
In cross-breeding, superior males of one breed are mated with superior females of another breed. This approach allows desirable qualities of two different breeds to be combined into a new stable commercial breed.
Hisardale is a well-known new breed of sheep developed in Punjab by crossing Bikaneri ewes with exotic Merino rams.
Out-crossing involves mating animals of the same breed that have no common ancestors on either side of pedigree up to 4-6 generations. Interspecific hybridization involves mating males and females of two different related species (e.g., mule = female horse × male donkey).
Since Bikaneri and Merino are two distinct breeds of sheep, this is a textbook example of cross-breeding.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect; out-crossing refers to mating of animals within the SAME breed having no common ancestors for 4-6 generations.
Incorrect; mutational breeding uses physical/chemical mutagens to induce new genetic variations (used mostly in plants like mung bean), not conventional sheep mating.
Factually exact; Hisardale sheep was produced by cross breeding Bikaneri ewes and Merino rams.
Incorrect; inbreeding refers to the mating of closely related individuals within the same breed for 4-6 generations, leading to inbreeding depression.
Out-crossing = SAME breed (no common ancestors 4-6 generations). Cross-breeding = TWO DIFFERENT breeds (e.g., Hisardale). Interspecific hybridization = TWO DIFFERENT species (e.g., Mule).
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