World Library  
Flag as Inappropriate
Email this Article

Sterility (physiology)

Article Id: WHEBN0030101225
Reproduction Date:

Title: Sterility (physiology)  
Author: World Heritage Encyclopedia
Language: English
Subject: Blynx, Insect growth regulator, Polecat-mink hybrid, Iris albicans, Tarragon
Publisher: World Heritage Encyclopedia

Sterility (physiology)

Sterility is the physiological inability to effect sexual reproduction in a living thing, members of whose kind have been produced sexually. Sterility has a wide range of causes. It may be an inherited trait, as in the mule; or it may be acquired from the environment, for example through physical injury or disease, or by exposure to radiation.

Mechanisms of sterility

Sterility can be caused by different closely related species breeding and producing offspring, these animals are usually sterile due to different numbers of chromosomes from the two parents, causing an imbalance in the resulting offspring making it viable but not fertile, this is the case with the Mule. Sterility can also be caused by chromosomal differences within the patient, these individuals tend to be known as a genetic mosaics. Loss of part of a chromosome can also cause sterility due to nondisjunction. Sterility can also be caused by selective breeding, where the trait you are selecting for is closely linked to genes involved in sex determination or fertility, for example goats breed to be polled (hornless), this results in a high number of intersex individuals among the offspring, which are typically sterile.[1] XX male syndrome is another cause of sterility, this is where the sexual determining factor on the Y chromosome (SRY) is transferred to the X chromosome due to an unequal crossing over, this gene indicated what gender the individual should be and causes the development of testes, causing the individual to be phenotypically male but genotypically female, the resulting individual is (information needed).

Economic uses of sterility

Economic uses of sterility include:

  • the production of certain kinds of seedless fruit, such as seedless tomato[2] or watermelon (though sterility is not the only available route to fruit seedlessness);
  • terminator technology, methods for restricting the use of genetically modified plants by causing second generation seeds to be sterile;
  • biological control; for example, trap-neuter-return programs for cats; and the sterile insect technique, in which large numbers of sterile insects are released, which compete with fertile insects for food and mates, thus reducing the population size of subsequent generations, which can be used to fight diseases spread by insect vectors such a malaria in mosquitoes.


  1. ^
  2. ^

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.