Feminization (biology)
development in an organism of physical characteristics that are usually unique to the female of the species
In biology and medicine, feminization is the development in an organism of physical characteristics that are usually unique to the females of the species. This may represent a normal developmental process, contributing to sexual differentiation. Feminization can also be induced by environmental factors, and this phenomenon has been observed in several animal species. In the case of transgender hormone therapy, it is intentionally induced medically.
Pathological feminization
In animals, when feminization occurs in a male, or at an inappropriate developmental age, it is often due to a genetic or acquired disorder of the endocrine system. In humans, one of the more common manifestations of abnormal feminization is gynecomastia, the inappropriate development of breasts which may result from elevated levels of feminizing hormones such as estrogens. Deficiency or blockage of virilizing hormones (androgens) can also contribute to feminization. In some cases, high levels of androgens may produce both virilizing effects (increased body hair, deepened voice, increased muscle mass, etc.) and feminizing effects (gynecomastia) since androgens can be converted to estrogens by aromatase in the peripheral tissues.
In insects, feminization can occur through inheritance of reproduction-manipulating endosymbionts. This promotes the inheritance of the endosymbionts because the endosymbionts are passed on by mothers to their eggs.
This brief starts where responsible research should: with the source description of “Feminization (biology)” as development in an organism of physical characteristics that are usually unique to the female of the species. Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the science & nature register because the source frames it as development in an organism of physical characteristics that are usually unique to the female of the species. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Nov 13, 2025. The linked authority identifier is Q5442904. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Feminization (biology)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.