Selective breeding is also known as ARTIFICIAL SELECTION where a breeder takes an individual in a species with desirable characteristics and uses them to breed from to produce offspring.
If these offspring do not have the desired characteristics they are killed or not used to breed from. This way, unwanted characteristics are bred out of the population.
BUT this makes the population deliberately have restricted alleles to only the desired alleles.
Over generations, this leads to the whole population having the same desired qualities (eg. Golden Retrievers - all white/gold) BUT with reduced genetic diversity
Selective breeding is commonly carried out to produce:
- High Yielding breeds of strains of plants
- Domestic animals
and to show desirable characteristics eg:
- Animals: Colour, height, fur
- Plants: Resisitance to disease, bigger grains, more sugar, bigger plants
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