Final answer:
Sire selection in biology involves finding a well-built and fertile male animal. Testing for selection involves examining genetic variation and identifying admixture, founder events, and hybridization. When selecting stars, criteria should be based on their life story and timescales.
Step-by-step explanation:
For sire selection in biology, it begins with finding a male animal that is well built, well nourished, and has a proven high degree of fertility. This is important for breeders, as selecting a male with these traits can increase the likelihood of producing desirable offspring. The selection process may also involve considering specific traits, such as in pigeon breeding, or identifying new species.
When testing for selection, genetic variation can be examined, as well as looking for admixture, founder events, and hybridization. These methods can help analyze the effects of selection on populations and identify different genetic factors at play.
In the context of star selection, criteria should be established based on the life story of stars and timescales. By considering these factors, breeders can make informed decisions about the stars they choose for specific objectives.