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Selective breeding can be unintentional, for example, resulting from the process of human cultivation; and it may also produce unintended – desirable or undesirable – results. For example, in some grains, an increase in seed size may have resulted from certain ploughing practices rather than from the intentional selection of larger seeds.
Selective breeding played a crucial role in the Green Revolution of the 20th century. Modern plant breeding is applied genetics, but its scientific basis is broader, covering molecular biology, cytology, systematics, physiology, pathology, entomology, chemistry, and statistics . It has also developed its own technology.
The mode of reproduction of a crop determines its genetic composition, which, in turn, is the deciding factor to develop suitable breeding and selection methods. Knowledge of mode of reproduction is also essential for its artificial manipulation to breed improved types.
Disease resistance breeding is the process of selective breeding to produce or improve disease resistance. It is also used more generally for breeding for disease tolerance. Types include: Plant breeding for disease resistance; Apple scab § Resistance breeding programs; Other examples of Selective breeding in other organisms
[1] [17] When food is limited, and the breeding season is long, and nest predation is intense, selection tends to favor a 'bet-hedging' strategy, where the risk of predation is spread over many smaller clutches. This means that the success of the number of offspring depends on whether they are large in size or not.
Culling is: ... the rejection or removal of inferior individuals from breeding. The act of selective breeding. As used in the practice of breeding pedigree cats, this refers to the practice of spaying or neutering a kitten or cat that does not measure up to the show standard (or other standard being applied) for that breed.
Savings interest rates today: Clock's ticking on peak yields of up to 4.86% as another Fed cut looms — Dec. 3, 2024
In r/K selection theory, selective pressures are hypothesised to drive evolution in one of two generalized directions: r - or K-selection. [2] These terms, r and K, are drawn from standard ecological formula as illustrated in the simplified Verhulst model of population dynamics: [9]