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A 1930s exhibit by the Eugenics Society.Some of the signs read "Healthy and Unhealthy Families", "Heredity as the Basis of Efficiency" and "Marry Wisely".Eugenics (/ j uː ˈ dʒ ɛ n ɪ k s / yoo-JEN-iks; from Ancient Greek εύ̃ (eû) ' good, well ' and -γενής (genḗs) ' born, come into being, growing/grown ') [1] is a set of beliefs and practices that aim to improve the genetic ...
Selective breeding (also called artificial selection) is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits (characteristics) by choosing which typically animal or plant males and females will sexually reproduce and have offspring together.
Inbreeding is the production of offspring from the mating or breeding of individuals or organisms that are closely related genetically. [1] By analogy, the term is used in human reproduction , but more commonly refers to the genetic disorders and other consequences that may arise from expression of deleterious recessive traits resulting from ...
Plato's political philosophy included the belief that human reproduction should be cautiously monitored and controlled by the state. [10] He advocated that selective breeding should be applied to both humans and animals. Plato recognized that this form of government control would not be readily accepted, and proposed the truth be concealed from ...
This has shaped human evolution for many years, but reasons why humans choose their mates are not fully understood. Sexual selection is quite different in non-human animals than humans as they feel more of the evolutionary pressures to reproduce and can easily reject a mate. [ 2 ]
Population bottleneck followed by recovery or extinction. A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.
The underlying idea is to improve the genetic basis of future generations and reduce incidence of genetic diseases and other undesirable traits. Some of the practices included in new eugenics are: pre-implantation diagnosis and embryo selection, [4] selective breeding, [5] and human embryo engineering and gene therapy. [6] [7]
Human reproduction naturally takes place as internal fertilization by sexual intercourse. During this process, the man inserts his erect penis into the woman's vagina and then either partner initiates rhythmic pelvic thrusts until the man achieves orgasm , which leads to ejaculation of semen containing sperm into the vaginal canal.