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• W4214529865 endingPage "479" @default.
• W4214529865 startingPage "457" @default.
• W4214529865 abstract "ABSTRACT Humans are shaped by evolution through natural selection, as are all species. While evolution is central to all biological processes, the key stage for competition and selection is reproduction, which encompasses various events from courtship and mating to fertilization and pregnancy. In humans, IVF is used to aid the intrinsically inefficient reproduction by coitus, and in several countries, the proportion of children born after IVF is increasing. While IVF is an enabling technology for infertile patients, it also circumvents reproductive barriers and changes selection pressures. This grand theme review describes the systematic differences between IVF and coitus in selection pressures on reproducing cells, individuals and populations. At the cellular unit of selection, for example, IVF favours different traits in spermatozoa (fast swimmers over short distances) than coitus does (forward mobility over longer distances). Similarly, a male with low sperm quality and a female who decides to delay her first birth to an advanced age, can both increase their reproductive fitness by IVF compared to if reproduction by coitus is their only option. In as much as delayed reproduction is a cultural trait, IVF thus enables cultural practices that may in their turn affect human evolution. A main point in this review is to discuss the interactive effects of biological and cultural traits in the context of IVF, and how they act in concert as drivers towards increased demand for IVF. It is not the aim of this review to argue against IVF, which no doubt is a major medical advancement, but rather to examine IVF and human evolution from a broad perspective, including potential longer-term impacts. Since IVF is a young technology, the empirical data indicative of evolutionary effects of IVF in humans are sparse. In general, we argue that IVF facilitates the redirection of resources away from reproduction in humans, since reproduction by IVF bypasses some of the resource-demanding processes that reproduction by coitus entails. Hence, IVF sets the evolutionary stage for a human species increasingly reliant on, and adapted to, technological means of reproduction." @default.
• W4214529865 created "2022-03-02" @default.
• W4214529865 creator A5040086177 @default.
• W4214529865 creator A5082748019 @default.
• W4214529865 date "2022-03-31" @default.
• W4214529865 modified "2023-10-16" @default.
• W4214529865 title "IVF and human evolution" @default.
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