Back نظام تحديد الجنس XY Arabic এক্সওয়াই লিঙ্গ-নির্ধারণ ব্যবস্থা Bengali/Bangla XY sistem određivanja spola BS Σύστημα φυλοκαθορισμού XY Greek Sistema XY de determinación del sexo Spanish روش گزینش جنسی XY Persian Système XY de détermination sexuelle French Sistema de determinación do sexo XY Galician एक्सवाई लिंग निर्धारण प्रणाली Hindi Ivart meghatározó XY rendszer Hungarian
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The XY sex-determination system is a sex-determination system present in many mammals, including humans, some insects (Drosophila), some snakes, some fish (guppies), and some plants (Ginkgo tree).
In this system, the sex of an individual usually is determined by a pair of sex chromosomes. Typically, females have two of the same kind of sex chromosome (XX), and are called the homogametic sex. Males typically have two different kinds of sex chromosomes (XY), and are called the heterogametic sex.[1] In humans, the presence of the Y chromosome is responsible for triggering male development; in the absence of the Y chromosome, the fetus will undergo female development. In most species with XY sex determination, an organism must have at least one X chromosome in order to survive.[2][3]
The XY system contrasts in several ways with the ZW sex-determination system found in birds, some insects, many reptiles, and various other animals, in which the heterogametic sex is female. A temperature-dependent sex determination system is found in some reptiles and fish.
- ^ Hake L, O'Connor C (2008). "Genetic Mechanisms of Sex Determination". Nature Education. Learn Science at Scitable. 1 (1): 25. Archived from the original on 2021-04-28.
- ^ Sherwood S (16 January 2014). "Can a Zygote Survive Without an X Sex Chromosome?". Education - Seattle PI. Retrieved 2020-11-08.
- ^ Sherwood S (April 25, 2017). "What Occurs When the Zygote Has One Fewer Chromosome than Usual?". Sciencing. Retrieved 2021-04-29.