From New World Encyclopedia

Eugenics is a social philosophy which advocates the improvement of human hereditary traits through various forms of intervention. The purported goals have variously been to create healthier, more intelligent people, save society's resources, and lessen human suffering.

Earlier proposed means of achieving these goals focused on selective breeding, while modern ones focus on prenatal testing and screening, genetic counseling, birth control, in vitro fertilization, and genetic engineering. Opponents argue that eugenics is immoral and is based on, or is itself, pseudoscience. Historically, eugenics has been used as a justification for coercive state-sponsored discrimination and human rights violations, such as forced sterilization of persons with genetic defects, the killing of the institutionalized and, in some cases, genocide of races perceived as inferior. Today, however, the ideas developed from eugenics are used to identify genetic disorders that are either fatal or result in severe disabilities. While there is still controversy, some of this research and understanding may prove beneficial.

The word eugenics etymologically derives from the Greek words eu (good) and gen (birth), and was coined by Francis Galton in 1883.

The term eugenics is often used to refer to movements and social policies that were influential during the early twentieth century. In a historical and broader sense, eugenics can also be a study of "improving human genetic qualities." It is sometimes broadly applied to describe any human action whose goal is to improve the gene pool. Some forms of infanticide in ancient societies, present-day reprogenetics, preemptive abortions, and designer babies have been (sometimes controversially) referred to as eugenic.

Eugenicists advocate specific policies that (if successful) would lead to a perceived improvement of the human gene pool. Since defining what improvements are desired or beneficial is, by many, perceived as a cultural choice rather than a matter that can be determined objectively (by empirical, scientific inquiry), eugenics has often been deemed a pseudoscience. The most disputed aspect of eugenics has been the definition of "improvement" of the human gene pool, such as what comprises a beneficial characteristic and what makes a defect. This aspect of eugenics has historically been tainted with scientific racism.

Early eugenicists were mostly concerned with perceived intelligence factors that often correlated strongly with social class. Many eugenicists took inspiration from the selective breeding of animals (where purebreds are valued) as their analogy for improving human society. The mixing of races (or miscegenation) was usually considered as something to be avoided in the name of racial purity. At the time this concept appeared to have some scientific support, and it remained a contentious issue until the advanced development of genetics led to a scientific consensus that the division of the human species into unequal races is unjustifiable. Some see this as an ideological consensus, since equality, just like inequality, is a cultural choice rather than a matter that can be determined objectively.

Eugenics has also been concerned with the elimination of hereditary diseases such as haemophilia and Huntington's disease. However, there are several problems with labeling certain factors as "genetic defects." In many cases there is no scientific consensus on what a "genetic defect" is. It is often argued that this is more a matter of social or individual choice. What appears to be a "genetic defect" in one context or environment may not be so in another. This can be the case for genes with a heterozygote advantage, such as sickle cell anemia or Tay-Sachs disease, which in their heterozygote form may offer an advantage against, respectively, malaria and tuberculosis. Many people can succeed in life with disabilities. Many of the conditions early eugenicists identified as inheritable (pellagra is one such example) are currently considered to be at least partially, if not wholly, attributed to environmental conditions. Similar concerns have been raised when a prenatal diagnosis of a congenital disorder leads to abortion.

Eugenic policies have been conceptually divided into two categories: Positive eugenics, which encourage a designated "most fit" to reproduce more often; and negative eugenics, which discourage or prevent a designated "less fit" from reproducing. Negative eugenics need not be coercive. A state might offer financial rewards to certain people who submit to sterilization, although some critics might reply that this incentive along with social pressure could be perceived as coercion. Positive eugenics can also be coercive. Abortion by "fit" women was illegal in Nazi Germany.

During the twentieth century, many countries enacted various eugenics policies and programs, including:

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