The selective breeding is the practice related to genetics and eugenics. It's the same way animal breeders would do for their livestock, with the goal of selecting for desirable traits to raise the quality of the human population.
Eugenics, the scientifically flawed and immoral doctrine of "planned breeding" and "race improvement," sprang to prominence in the early 20th century. "To improve the natural, physical, mental, and temperamental traits of the human family" was eugenics' stated rationale.
Unfortunately, this sentiment was often expressed in an effort to prevent those who were deemed to be "unfit" from becoming parents. Researchers in eugenics thought that by examining large human families where a certain undesirable feature manifested, they could show a genetic pattern of inheritance for the trait and that such discoveries would justify policies targeted at eradicating the linked genes from the population.
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