Here's how it works:
* Identification of Desirable Traits: Breeders identify specific traits they want to enhance in a population of plants or animals. This could be anything from increased milk production in cows to disease resistance in wheat.
* Selection of Parents: Individuals exhibiting the desired traits are chosen as breeding pairs.
* Breeding and Selection: The selected parents are allowed to reproduce, and their offspring are evaluated for the desired traits. Those offspring with the strongest expression of those traits are chosen for the next generation of breeding.
* Repeated Cycles: This process of selecting and breeding is repeated over many generations, gradually increasing the frequency of the desired traits within the population.
Important Note: While selective breeding is a powerful tool for improving crops and livestock, it is a slower process than modern genetic engineering techniques like CRISPR-Cas9. Modern techniques can directly modify genes, allowing for much faster and targeted changes.
